1980. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base dated 1977; interpretations derived from soil map constructed 1967.; "Projection and 10,000-meter grid tick... Dept. of Agriculture, Soil Conservation Service (Lanham, Md.).
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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.
1862. United States. Army. Corps of Topographical Engineers. Scale approximately 1:17,600; 1 map: color; 84 x 54 cm South Mountain, Battle of, Md., 1862--Maps.
1862. United States. Army. Corps of Topographical Engineers. Scale approximately 1:18,500; 1 map; 80 x 51 cm South Mountain, Battle of, Md., 1862--Maps.
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.).
1914. National Highways Association. Relief shown by shading.; This map shows tentative locations for part of a National Highways system. 26 x 46 centimeters Scale 1:1,000,000 General ... The Association (Washington, D.C).
1927. United States. Bureau of Public Roads. Base map from U.S. Geological Survey state map.; "Data corrected to Dec 31, 1927." 46 x 71 centimeters, on sheet 55 x 79 centimeters Scale 1:500,00... U.S. Geological Survey (Washington, D.C).