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Creator
- Owen, Andrew24
- Murphy, Brendan21
- United States. Works Progress Administration of Pennsylvania.10
- Levinson, David M6
- Geological Survey (U.S.)3
- Maryland Geological Survey3
- United States. Soil Conservation Service3
- Sanborn Map Company2
- United States. Army. Corps of Topographical Engineers2
- Big Ten Academic Alliance Geospatial Information Network1
- Herrman, Augustine, 1621 or 1622-16861
- Hinton, John, -17811
- Johns Hopkins University1
- Lang, John C.1
- Maryland. Conservation Department.1
- Mason, Charles, 1728-17861
- Michler, N. (Nathaniel), 1827-1881, cartographer1
- Mitchell, S. Augustus (Samuel Augustus), 1792-18681
- Moll, Herman, -17321
- National Geographic Society (U.S.). Map Department1