Author
Pennsylvania. Department of Conservation and Natural Resources
3
Pennsylvania. Bureau of Topographic and Geologic Survey
2
Philadelphia Historical Commission
2
Arthur, Dan, 1945-
1
Awbury Arboretum (Philadelphia, Pa.)
1
Bacon, Margaret Hope
1
College of Physicians of Philadelphia
1
Delaware and Lehigh National Heritage Corridor Market Towns Initiative
1
Energy Cooperative (Philadelphia, Pa.)
1
Folwell, Richard, 1768?-1814
1
Folwell, Richard, 1768?-1814,
1
Germantown Historical Society
1
Harrison, Eliza Cope
1
Heritage Conservancy
1
Keiper, Ronald R.
1
Lackawanna Heritage Valley Steering Committee
1
Louden, Mark Laurence,
1
McCoy, Kaycee L.
1
Pennsylvania Downtown Center
1
Pennsylvania. Capitol Preservation Committee
1
Pennsylvania. Department of Community and Economic Development
1
Ruschenberger, W. S. W. 1807-1895
1
Schmitt, Zachary
1
Sevon, William D.,
1
Simon, Grant Miles, 1887-1967
1
Thomas R. Deans Associates (Milton, Pa.)
1
Twentieth Century Club of Pittsburgh
1
United States. National Park Service
1
Watson, Kevin
1
Wright, John M.
1