Author
ADC (Firm)
17
Carey, Mathew, 1760-1839
10
Rand McNally and Company
9
Smith, J. L.
9
G.M. Hopkins & Co
8
Bromley, George Washington
7
Pennsylvania
6
Alexandria Drafting Company
5
DeLorme Mapping Company
5
Franklin Survey Company
5
KuÌmmerly + Frey
5
Pennsylvania Dept. of Conservation and Natural Resources
5
Phlash (Firm : Philadelphia, Pa.)
5
Barnes, R. L.
4
Beers, F. W.
4
Charles D. Hevenor Company
4
E.P. Noll & Co
4
Gardner, David E.
4
Geological Survey of Pennsylvania
4
MacInnes, Sharon Cook
4
Morse, Jedidiah, 1761-1826
4
Nichols, Beach
4
American Society for Colonizing the Free People of Colour of the United States
3
Ashmun, J. 1794-1828
3
Caldwell, J. A.
3
Dunlap, A. R.
3
Gross, Alexander, 1879-1958
3
Hallwag AG
3
Harland, Derek
3
Historical Society of Pennsylvania
3
Hopkins, Griffith Morgan
3
Jonathan Sheppard Books
3
Mario Zucca Illustration
3
Melish, John, 1771-1822
3
Mercer, Charles Fenton, 1778-1858
3
Mitchell, S. Augustus 1792-1868
3
Mural Arts Program (Philadelphia, Pa.)
3
Parsons, William, 1701-1757
3
Pennsylvania Railroad
3
Philadelphia & Reading Railroad Co
3
Philadelphia (Pa.) Office of the Managing Director
3
Philadelphia Transportation Company
3
Roberts, William F.
3
Smith, Frank
3
Southeastern Pennsylvania Transportation Authority
3
United States Bureau of Chemistry and Soils
3
United States National Park Service
3
Virga, Vincent
3
Wainwright, Nicholas B.
3
Zucca, Mario
3
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