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1861. Rumsey, David, 1944- and Boschke, A. This layer is a georeferenced image of a map of the District of Columbia (Washington D.C.) published in 1861. The original is a partial cadastral m... Cartography Associates.
2014. United States. Bureau of Transportation Statistics and Jessberger, Steven. This point shapefile contains the locations of travel monitoring station sin the United States. The attributes for these databases have been intent... United States. Bureau of Transportation Statistics.
2000. U.S. Census Bureau. Geography Division. This polygon shapefile represents the unified school district boundaries in the District of Columbia. School districts are geographic entities with... U.S. Census Bureau. Geography Division.
2001. Geological Survey (U.S.). This data set includes a selection of urban areas in the United States derived from the urban areas layer of the Digital Chart of the World (DCW). ... Geological Survey (U.S.).
2013. United States. Bureau of Transportation Statistics and United States. Bureau of the Census. Geography Division. This polygon shapefile contains areas of urban land extracted from the United States Census Bureau's MAF/TIGER Database (MTDB). The MTDB represents... United States. Bureau of Transportation Statistics.
2004. National Atlas of the United States. This point shapefile includes Holocene volcanoes, which are those thought to be active in the last 10,000 years, that are within an extended area o... National Atlas of the United States.
2013. Institute for Water Resources (U.S.). Navigation Data Center. This point shapefile contains the locations of waterways locks in the United States. The Navigation Data Center had several objectives in developin... United States. Bureau of Transportation Statistics.
2011. Vanderbilt Engineering Center for Transportation Operations and Research, United States. Bureau of Transportation Statistics, and Waterborne Commerce Statistics Center (U.S.). The National Waterway Network is comprised of a link database and a node database. Links are line strings, which consist of beginning and end point... United States. Bureau of Transportation Statistics.
2011. Vanderbilt Engineering Center for Transportation Operations and Research, Waterborne Commerce Statistics Center (U.S.), and United States. Bureau of Transportation Statistics. The National Waterway Network is comprised of a link database and a node database. Links are line strings, which consist of beginning and end point... United States. Bureau of Transportation Statistics.