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.
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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.