2010. National Geophysical Data Center. This shapefile contains isodynamic lines (lines of equal total intensity of the Earth's magnetic field), derived from the International Geomagnetic... National Atlas of the United States.
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2010. National Geophysical Data Center. This line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Fie... National Atlas of the United States.
1999. Geological Survey (U.S.). This line shapefile portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the i... Geological Survey (U.S.).
1839. Burr, David H., 1803-1875. Detailed map showing drainage, township and county boundaries, cities and towns, canals, roads, and railroads. Relief shown by hachures.; From Burr... J. Arrowsmith (London).
1862. United States. Army. Corps of Engineers. Pea Ridge, Battle of, Ark., 1862--Maps.
1901. United States. General Land Office. Shows railroads, railaord land grant limits, counties, drainage, and land offices.; Relief shown by shading. 57 x 70 centimeters Scale: 1:760,320; ... A. B. Graham Photo-litho (Washington [District of Columbia).
1847. United States. Army. Corps of Topographical Engineers. Engraved on stone by E. Weber & Co., Baltimore.; Relief shown by hachures and spot heights.; Includes: Table of geographical positions on the route... The Army? (Washington?).
1846. United States. Army. Corps of Topographical Engineers. Arkansas River--Maps.
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.