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1. 100-Meter Resolution Color-Sliced Elevation of the Conterminous United States

2012. Geological Survey (U.S.). This layer is a georeferenced raster image displaying color-sliced elevation data for the Conterminous United States at 100-meter resolution, using... National Atlas of the United States.

2. 100-Meter Resolution Elevation of the Conterminous United States

2012. Geological Survey (U.S.). This layer is a georeferenced raster image displaying elevation data for the conterminous United States. These data were derived from the National ... National Atlas of the United States.

3. 100-Meter Resolution Impervious Surface of the Conterminous United States, 2001

2001. Geological Survey (U.S.). This raster layer is a georeferenced image containing impervious surface data for the conterminous United States. Data are in an Albers Equal-Area ... Geological Survey (U.S.).

4. 100-Meter Resolution Land Cover of the Conterminous United States, 2001

2001. Geological Survey (U.S.). This raster layer is a georeferenced image containing land cover data for the conterminous United States, in an Albers Equal-Area Conic projection ... National Geospatial Program, The National Map Small Scale.

5. 100-Meter Resolution Land/Water Mask of the Conterminous United States, 2013

2013. Geological Survey (U.S.). This raster layer is a georeferenced image containing a 100-meter resolution land and water mask of the conterminous United States, with separate v... National Atlas of the United States.

6. 100-Meter Resolution Tree Canopy of the Conterminous United States, 2001

2007. Geological Survey (U.S.). This raster layer is a georeferenced image containing tree canopy data for the conterminous United States, in an Albers Equal-Area Conic projection... Geological Survey (U.S.).

7. 1:1,000,000-Scale Coastline of the United States, 2014

2014. National Atlas of the United States. This line shapefile includes Global Map data showing the coastline of the United States, Puerto Rico, and the U.S. Virgin Islands. The United State... National Atlas of the United States.

8. 1:1,000,000-Scale Combined Statistical Areas, 2013

2013. National Atlas of the United States. This polygon shapefile contains combined statistical areas in the United States and Puerto Rico. Combined statistical areas consist of two or more ... National Atlas of the United States.

9. 1:1,000,000-Scale Contours of the Conterminous United States

2014. Geological Survey (U.S.). This line shapefile shows elevation contour lines for the conterminous United States. The map layer was derived from the 100-meter resolution eleva... National Atlas of the United States.

10. 1:1,000,000-Scale Core Based Statistical Areas, 2013

2013. National Atlas of the United States. This polygon shapefile contains core based statistical areas in the United States and Puerto Rico. The map layer was created from the CENSUS 2010 T... National Atlas of the United States.

11. 1:1,000,000-Scale County Boundaries of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile contains the county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands, by showing the counties as ar... Geological Survey (U.S.).

12. 1:1,000,000-Scale County Boundary Lines of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile contains the county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. This layer was derived from t... Geological Survey (U.S.).

13. 1:1,000,000-Scale Ferries of the United States, 2014

2014. National Atlas of the United States. This map layer portrays the ferries on major roads in the United States and Puerto Rico. Ferries are ships that carry vehicles, passengers, and car... National Atlas of the United States.

14. 1:1,000,000-Scale Major Roads of the United States, 2012

2012. Geological Survey (U.S.). This map layer portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the indivi... Geological Survey (U.S.).

15. 1:1,000,000-Scale National Wilderness Preservation System of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile consists of National Wilderness Preservation System areas of 320 acres or more, in the United States, Puerto Rico, and the U... National Atlas of the United States.

16. 1:1,000,000-Scale Railroads, United States, 2012

2012. National Atlas of the United States. This line shapefile represents railroads in the conterminous United States and Alaska for 2012 at 1:1,000,000 scale. This layer is part of the 1997... National Atlas of the United States.

17. 1:1,000,000-Scale Railroads, United States, 2014

2014. National Atlas of the United States. This line shapefile represents railroads in the conterminous United States and Alaska for 2014 at 1:1,000,000 scale. This is a revised version of t... National Atlas of the United States.

18. 1:1,000,000-Scale State Boundaries of the United States, 2012

2012. National Atlas of the United States. This polygon shapefile portrays the state boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by e... National Atlas of the United States.

19. 1:1,000,000-Scale State Boundaries of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile portrays the state boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by e... National Atlas of the United States.

20. 1:1,000,000-Scale Streams of the United States, 2014

2014. Geological Survey (U.S.). This map layer shows streams of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was produced primarily from the Medium-R... Geological Survey (U.S.).

21. 1:1,000,000-Scale Waterbodies and Wetlands of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile represents waterbodies and wetlands of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was produc... Geological Survey (U.S.).

22. 1-Kilometer Resolution, North American Land Cover Characteristics, 1992-1993

1992. Geological Survey (U.S.). This raster layer is a georeferenced grid map image of land cover characteristics for North America, excluding Hawaii, and including the Caribbean ... Geological Survey (U.S.).

23. 200-Meter Resolution Land Cover, Conterminous United States, 1992

1992. Geological Survey (U.S.). This raster layer is a georeferenced image of 1992 land cover for the conterminous United States, at a resolution of 200 meters. The map layer was ... Geological Survey (U.S.).

24. Agricultural Minerals Operations

2003. Geological Survey (U.S.). This point shapefile represents locations of agricultural minerals operations in the United States. The data represent commodities covered by the M... National Atlas of the United States.

25. Agriculture Census of the United States, 2002

2002. National Atlas of the United States. This polygon shapefile portrays a selected set of information that was collected for the 2002 Census of Agriculture by the National Agricultural St... National Atlas of the United States.

26. Agriculture Census of the United States, 2007

2007. National Atlas of the United States. This polygon shapefile portrays a selected set of information that was collected for the 2007 Census of Agriculture by the National Agricultural St... National Atlas of the United States.

27. Airports of the United States, 2012

2012. Geological Survey (U.S.). This point shapefile includes airports in the United States, Puerto Rico and the U.S. Virgin Islands. The data were derived from an extract of the ... Geological Survey (U.S.).

28. Areas and Facies Types of Metamorphism: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of major calderas and impact structures in the United States. This layer is part of the Geologic Map of the ... Geological Survey (U.S.).

29. Bailey's Ecoregions and Subregions of the United States, 2004

2004. United States. Forest Service. This polygon shapefile is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.... National Atlas of the United States.

30. Bathymetric Shaded Relief of North America

2001. National Atlas of the United States. The Bathymetric Shaded Relief of North America map layer shows depth ranges using colors, with relief enhanced by shading. The image was derived fr... National Atlas of the United States.

31. Bathymetry of North America

2001. National Atlas of the United States. The Bathymetry of North America map layer shows depth ranges using colors. The image was derived from the National Geophysical Data Center's ETOPO2... National Atlas of the United States.

32. Breeding Bird Survey Route Locations for Lower 48 States, 1966-1998

1966. Patuxent Wildlife Research Center. This line shapefile portrays the current routes used for conducting Breeding Bird Surveys in the lower 48 States. This layer is part of the 1997-20... National Atlas of the United States.

33. Causes of Forest Fragmentation in the United States (270 Meter Resolution), 1992

1992. Wade, Tim. This raster image is a 270-meter resolution grid map of the conterminous United States in GeoTIFF format, created from National Land Cover Data (NL... National Atlas of the United States.

34. Causes of Forest Fragmentation in the United States (540 Meter Resolution), 1992

1992. Wade, Tim. This raster layer is a 540 meter resolution grid map of the conterminous United States in GeoTIFF format, created from National Land Cover Data (NL... National Atlas of the United States.

35. Census American Indian Reservations, 1995 - Iowa

1995. This datalayer depicts feature location and other associated data for American Indian tribal entities. Categories included here are: American India...

36. Census Block Groups, 1995 - Iowa

1995. The polygons represent U.S. Census Block Groups for the state. A Block Group (BG) is a cluster of census blocks having the same first digit of thei...

37. Census Blocks, 1995 - Iowa

1995. The polygons in this datalayer represent U.S. Census Blocks for the entire state. Census blocks are areas bounded on all sides by visible features,...

38. Census Class A Roads, 1995 - Iowa

1995. This datalayer displays the Type A class roads thoughout the state. Feature Class A roads include: Primary roads with limited access (interstate hi...

39. Census Congressional Districts, 1995 - Iowa

1995. The polygons represent Congressional Districts (104th Congress) for the entire state. Congressional districts (CDs) are the 435 areas from which pe...

40. Census Counties, 1990 - Iowa

1990. This datalayer displays the counties for the state, based on a ground condition of January 1, 1990. The primary legal divisions of most states are ...

41. Census County Divisions and Minor Civil Divisions, 1990 - Iowa

1990. This datalayer displays Census County Divisions and Minor Civil Divisions based on the 1990 Census. Census county divisions (CCDs) are county subdi...

42. Census County Divisions and Minor Civil Divisions, 1995 - Iowa

1995. This datalayer displays Census County Divisions and Minor Civil Divisions for the entire state. Census County Divisions (CCDs) are county subdivisi...

43. Census Hydrographic Features, 1995 - Iowa

1995. This datalayer displays the hydrographic features throughout the state. This category includes shorelines of all water regardless of the classifica...

44. Census Key Geographic Locations, 1995 - Iowa

1995. This datalayer displays the Key Geographic Locations (KGLs) throughout the state, as definded by the US Census Bureau. Essential attribute data inc...

45. Census Landmark Line Features, 1995 - Iowa

1995. This datalayer displays landmark line features throughout the state. "Landmark" is the general name given to a cartographic (or locational) landmar...

46. Census Landmark Point Features, 1995 - Iowa

1995. This datalayer displays landmark point features throughout the state. "Landmark" is the general name given to a cartographic (or locational) landma...

47. Census Landmark Polygon Features, 1995 - Iowa

1995. This datalayer displays polygon landmark features throughout the state. "Landmark" is the general name given to a cartographic (or locational) land...

48. Census Metropolitan Statistical Areas, 1995 - Iowa

1995. This datalayer displays Metropolitan Statistical Areas (MSA) for the state. Metropolitan statistical areas (MSAs) are metropolitan areas (MAs) that...

49. Census Miscellaneous Ground Transportation Features, 1995 - Iowa

1995. This datalayer displays miscellaneous ground transportation features in the state. Features other than roads or railroads may be included in this l...

50. Census Non-Visible Features, 1995 - Iowa

1995. This datalayer displays the non-visible features for the state. This layer contains various types of nonvisible lines used to maintain the topology...

51. Census Physical Features, 1995 - Iowa

1995. This datalayer represents tangible physical features throughout the state. These features are neither transportation nor hydrographic in nature but...

52. Census Places, 1995 - Iowa

1990. This datalayer displays the Census Places for the state based on the ground condition of January 1, 1990. Places, for the reporting of decennial ce...

53. Census Places, 1995 - Iowa

1995. This datalayer displays the Census Places for the state based on the ground condition of January 1, 1995. Places, for the reporting of decennial ce...

54. Census Railroads, 1995 - Iowa

1995. This datalayer displays a variety of railroad features for the state. Categories represented here include: Primary rail line: A railroad in this c...

55. Census Traffic Analysis Zones, 1995 - Iowa

1995. This datalayer displays the Traffic Analysis Zones (TAZ) for the state. A traffic analysis zone (TAZ) is a statistical entity delineated by state o...

56. Census Unclassified Features, 1995 - Iowa

1995. This datalayer displays the line features for the state that have not yet been identified or have been classified as unknown. All complete chains, ...

57. Census Unified School Districts, 1995 - Iowa

1995. This datalayer displays the Unified School Districts for the entire state. A unified school district is inclusive of kindergarten through twelfth g...

58. Census Urbanized Areas, 1995 - Iowa

1995. This datalayer displays the Urbanized Areas (UAs) for the state. The Census Bureau defines UAs as an area consisting of a central place(s) and adja...

59. Census Voting Districts, 1995 - Iowa

1995. This datalayer displays the Voting Districts throughout the state. A Voting District (VTD) is the generic name for a variety of geographic entities...

60. Census Water Bodies, 1995 - Iowa

1995. This datalayer displays water bodies throughout the state. This category includes lakes, ponds, bays, rivers, reservoirs and other water features. ...

61. Cities and Towns of the United States, 2004

1972. National Atlas of the United States. This point shapefile includes cities in the United States, Puerto Rico and the U.S. Virgin Islands. These cities were collected from the 1970 Natio... National Atlas of the United States.

62. Cities and Towns of the United States, 2014

2014. National Atlas of the United States. This point shapefile includes cities and towns in the United States, Puerto Rico, and the U.S. Virgin Islands. A city or town is a place with a rec... National Atlas of the United States.

63. Civil War Southern States : Rivers, ca. 1864

1864. River locations during the US Civil War in the Confederate States. Vector data extracted from digital map provided by the Library of Congress at ht...

64. Civil War Southern States : State Boundaries, ca. 1864

1864. State boundaries during the US Civil War in the Confederate States. Vector data extracted from digital map provided by the Library of Congress at h...

65. Classification of Forest Fragmentation in North America, 1992

1992. Ritters, Kurt. This raster layer is a grid map of North America including the Caribbean and most of Mexico in GeoTIFF format. The map layer is an excerpt from a g... National Atlas of the United States.

66. Coal Fields of the United States

2001. Eastern Energy Resource Surveys Team (Geological Survey). This polygon shapefile shows the coal fields of Alaska and the conterminous United States. Most of the material for the conterminous United States ... National Atlas of the United States.

67. Color Conterminous United States Shaded Relief, 200-Meter Resolution

2002. National Atlas of the United States. The color conterminous United States shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of the conter... National Atlas of the United States.

68. Color Conterminous United States Shaded Relief, 200-Meter Resolution, Albers projection

2002. National Atlas of the United States. The color conterminous United States shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of the conter... National Atlas of the United States.

69. Color North America Shaded Relief: 1-Kilometer Resolution

1993. USGS National Center for EROS. The North America Shaded Relief data were derived from the GTOPO30 elevation data. GTOPO30 is a global digital elevation model (DEM) with a horizon... National Atlas of the United States.

70. Construction Minerals Operations

2003. Geological Survey (U.S.) Minerals Information Team. This point shapefile represents construction minerals operations in the United States. The data represent commodities covered by the Minerals Infor... National Atlas of the United States.

71. Costly Landslide Events in the United States

2001. Godt, Jonathan W. This polygon shapefile shows point locations of costly individual landslide events in the 50 United States and Puerto Rico. Landslide locations wer... National Atlas of the United States.

72. Costly Regional Landslide Events in the United States

2001. Godt, Jonathan W. This polygon shapefile contains information on costly regional landslide events in the 50 United States and Puerto Rico. The extents of the regiona... National Atlas of the United States.

73. County Boundaries of the United States, 1980

1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

74. County Boundaries of the United States, 1990

1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

75. County Boundaries of the United States, 2000

2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

76. Crushed Stone Operations in the United States, 2002

2001. Geological Survey (U.S.) Minerals Information Team. This point shapefile represents locations of crushed stone operations in the United States. These data were obtained from information reported volu... National Atlas of the United States.

77. Current Distributions of Selected Amphibians in the United States, 1941-2000

1941. Lannoo, Michael J., Blackburn, Laura, and Nanjappa, Priya. This polygon shapefile portrays the distribution of 10 selected amphibians in the United States, based on historical literature and museum records ... National Atlas of the United States.

78. Eastern United States, 1806 (Image 1 of 7) (Raster Image)

1806. This layer is a georeferenced raster image of the historic paper map entitled: A new map of the United States of America : including part of Louisi...

79. Eastern United States, 1806 (Image 2 of 7) (Raster Image)

1806. This layer is a georeferenced raster image of the historic paper map entitled: A new map of the United States of America : including part of Louisi...

80. Eastern United States, 1806 (Image 3 of 7) (Raster Image)

1806. This layer is a georeferenced raster image of the historic paper map entitled: A new map of the United States of America : including part of Louisi...

81. Eastern United States, 1806 (Image 4 of 7) (Raster Image)

1806. This layer is a georeferenced raster image of the historic paper map entitled: A new map of the United States of America : including part of Louisi...

82. Eastern United States, 1806 (Image 5 of 7) (Raster Image)

1806. This layer is a georeferenced raster image of the historic paper map entitled: A new map of the United States of America : including part of Louisi...

83. Eastern United States, 1806 (Image 6 of 7) (Raster Image)

1806. This layer is a georeferenced raster image of the historic paper map entitled: A new map of the United States of America : including part of Louisi...

84. Eastern United States, 1806 (Image 7 of 7) (Raster Image)

1806. This layer is a georeferenced raster image of the historic paper map entitled: A new map of the United States of America : including part of Louisi...

85. Engineering Aspects of Karst

1984. Tobin, B. D. and Weary, David J. This polygon shapefile is a digital version of U.S. Geological Survey Open File Report 2004-1352, Engineering Aspects of Karst. The open-file repor... National Atlas of the United States.

86. Fault Lines: Geology of the Conterminous United States, 2005

1994. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile represents the major fault lines in the United States. A fault is a fracture or fracture zone in the Earth's crust along which ... Geological Survey (U.S.).

87. Fault Lines with Line Decorations: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile represents the major fault lines in the United States. A fault is a fracture or fracture zone in the Earth's crust along which ... Geological Survey (U.S.).

88. Federal Lands of the United States, 2006

1972. National Atlas of the United States. This polygon shapefile contains federally owned or administered lands of the United States, Puerto Rico, and the U.S. Virgin Islands. Only areas of... National Atlas of the United States.

89. Fees and Easements, Iowa, Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains combined PAD-US Fee and Easements features for Iowa. The USGS Protected Areas Database of the United States (PAD-US... Gap Analysis Program (U.S.).

90. Fees and Easements, LCC 13, Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains combined PAD-US Fee and Easements features for Landscape Conservation Cooperative (LCC) 13. The USGS Protected Area... Gap Analysis Program (U.S.).

91. Fees and Easements, Midwest U.S., Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains combined PAD-US Fee and Easements features for the midwestern United States. The USGS Protected Areas Database of t... Gap Analysis Program (U.S.).

92. Ferrous Metal Mines

2003. Geological Survey (U.S.) Minerals Information Team. This point shapefile includes ferrous metal mines in the United States. The data represent commodities covered by the Minerals Information Team (MI... National Atlas of the United States.

93. Ferrous Metal Processing Plants

2003. Geological Survey (U.S.) Minerals Information Team. This point shapefile includes ferrous metal processing plants in the United States. The data represent commodities covered by the Minerals Informat... National Atlas of the United States.

94. Flood Insurance Risk Zones, Iowa, 2011

2011. The flood insurance risk zone layer contains information about the flood hazards for Iowa. These zones are used by the federal Emergency Management...

95. Forest Cover Types, United States, 2002

2002. United States. Forest Service and Geological Survey (U.S.). This raster layer portrays general forest cover types for the United States in GeoTIFF format. Data were derived from Advanced Very High Resolution... National Atlas of the United States.

96. Generalized Glacial Limit Lines: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the glacial limit lines in the United States. This layer is part of the Geologic Map of the United States, originally pub... Geological Survey (U.S.).

97. Generalized Glacial Limit Lines with Line Decorations: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the glacial limit lines, with line decorations (added for display purposes) in the United States. This layer is part of t... Geological Survey (U.S.).

98. Geologic Unit Text Labels: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile contains text labels (for display purposes) of the geologic line coverage in the United States. This layer is part of the Geolo... Geological Survey (U.S.).

99. Geologic Units (Lines): Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of geologic units within the United States. This layer is part of the Geologic Map of the United States, ori... Geological Survey (U.S.).

100. Geologic Units (Polygons): Geology of the Conterminous United States, 2005

1994. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This polygon shapefile shows the boundaries of geologic units within the United States. This layer is part of the Geologic Map of the United States... Geological Survey (U.S.).