Johnson and Ward Historic Survey Map - 1862

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Johnson's Georgetown and the city of Washington historic survey : the capital of the United States of America / by Johnson and Ward.

Historic View of DC in 1792

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Map of Washington DC from 1792,

Jattnig Plan Historic Map - 1800

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Plan of the city of Washington from 1800.

Hawkins Topography Historic Map - 1791

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Topography of the federal city, 1791 : [Washington D.C.] / by Don A. Hawkins, Washington, D.C.

MS4 Sewer Shed

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Allegheny County Basin Outlines Map

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This basins dataset was created to initiate regional watershed approaches with respect to sewer rehabilitation.

Sidewalks 1999

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Latrobe Historic Survey Map - 1815

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Map exhibiting the property of the U.S. in the vicinity of the Capitol : colored red, with the manner in which it is proposed to lay off the same in building lots, as described in the report to the Sup't of the city to which this is annexed / BHLatrobe, one of the surveyors of the city of Washington, Dec. 3d 1815.

Roads 1999

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Historic Streams

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Philadelphia streams as mapped by Charles Ellet in 1842 and Previous study of historic streams conducted by PWD.