1924. Maryland Geological Survey. Shows the topography and election districts of Allegany County, Maryland. Waterways and man-made features such as roads, railroads, bridges, and bu... Maryland Geological Survey (Baltimoré).
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1927. University of Maryland, College Park. 47 x 81 cm. Scale 1:500,000. 1 inch = 8 miles General Map Collection. Maryland. State Department of Forestry.
1917. Maryland Geological Survey. Copyrighted by Maryland Geological Survey, 1910.; "Based on surveys made in cooperation with the United States Geological Survey."; Insets: Elkton ... Maryland Geological Survey (Baltimore, Md.?).
1925. Maryland Geological Survey. Relief shown by contours. 66 x 91 centimeters Scale 1:62,500 General Map Collection. A. Hoen & Co (Baltimore).
1925. National Geographic Society (U.S.). Map Department. Relief shown by gradient tints and hachures.; Includes 3 inset maps.; Inset maps: Washington and vicinity -- Baltimore and vicinity --Wilmington an... National Geographic Society (Washington, D.C).
1979. United States. Soil Conservation Service. Base source: USGS county base dated 1976; interpretations derived from soil map constructed 1961.; "Projection and 10,000-meter grid ticks, zone 18... Dept. of Agriculture, Soil Conservation Service (Lanham, Md.).
2004. National Atlas of the United States. This polygon shapefile portrays county level data for the fiscal-year-2004 National Fire Plan - Hazardous Fuels Reduction Program. The purpose of t... National Atlas of the United States.
1972. National Atlas of the United States. This polygon shapefile contains National Wilderness Preservation System areas of 640 acres or more, in the United States, Puerto Rico, and the U.S.... National Atlas of the United States.
2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Canada Centre for Mapping, and Geological Survey (U.S.). This polygon shapefile contains bathymetric data with depth in metres for ocean areas covered by the extent of the North American Atlas project. Is... Canada Centre for Mapping.
2003. United States. Environmental Protection Agency. This polygon shapefile shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of... National Atlas of the United States.