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.
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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.
2010. Geological Survey (U.S.). This polygon shapefile portrays the Public Land Surveys of the United States, including areas of private survey, donation land claims, and land gra... Geological Survey (U.S.).
2012. Rukstales, Kenneth S. (compiler). This polygon shapefile represents seismic hazards in the United States. The data represent a model showing the probability that ground motion will ... National Atlas of the United States.
2005. Geological Survey (U.S.). This point shapefile contains the locations and attributes of significant, historic earthquakes that caused deaths, property damage, and geological... National Atlas of the United States.
2006. United States. Agricultural Research Service. This polygon shapefile portrays the spread, by year, of the Africanized honey bee (AHB) in the United States, Puerto Rico, and the U.S. Virgin Isla... National Atlas of the United States.
2005. Geological Survey (U.S.). This polygon shapefile portrays the state boundaries of the United States, and the boundaries of Puerto Rico and the U.S. Virgin Islands. The map l... Geological Survey (U.S.).
1886. Dinsmore, A. F. Relief shown by hachures.; Prime meridians: Greenwich, Washington.; At head of title: Department of the Interior, General Land Office, Wm. A.J. Spa... General Land Office (Washington, D.C).
1914. United States. General Land Office. Relief shown by shading.; Prime meridians: Greenwich and Washington.; Insets: City of Little Rock and City of Hot Springs. 58 x 70 centimeters Scal... General Land Office (Washington, D.C).
1878. United States. General Land Office. Gives longitude west from Washington and Greenwich.; "J. A. Williamson, Commissioner." 57 x 71 centimeters Scale approximately 1:760,320; 12 miles ... General Land Office.