Author
United States. National Park Service
23
Pennsylvania Historical and Museum Commission
14
Graham, Daniel A., 1948-
6
Historical Society of Pennsylvania
6
National Trust for Historic Preservation in the United States
6
Hagley Museum and Library
5
Pennsylvania Historical Commission
5
United States. Federal Highway Administration
5
American Association for State and Local History
4
Bergheim, Laura, 1962-
4
Gadomski, Michael P.,
4
Sawin, Nancy C.
4
University of the State of New York
4
Colimore, Edward, 1950-
3
Cromie, Alice
3
Fijałkowski, Paweł
3
Friends of Laurel Hill Cemetery
3
Maryland Historical Trust
3
Morris County Heritage Commission (N.J.)
3
Parcs Nationaux et Lieux Historiques
3
Pennsylvania. Department of Transportation
3
Rakowski, Stefan
3
Unrau, Harlan D.
3
Young, David W.
3
Baldwin, William C.,
2
Beard, Lucienne
2
Bradley, James W.
2
Cantor, George, 1941-
2
Cantwell, Anne-Marie E., 1935-
2
Carper, Janice M.,
2
Catholic Church Archdiocese of Philadelphia Catholic Information Center
2
Cultural Heritage Research Services
2
Delaware Historic Markers Commission
2
Dickson, Carl
2
Eleutherian Mills-Hagley Foundation
2
Fairmount Park Council for Historic Sites (Philadelphia, Pa.)
2
Fenn, Elizabeth A. 1959-
2
Fitzpatrick, Sandra
2
Friends of Hopewell Furnace National Historic Site
2
Gardino, Robert
2
Goodwin, Maria R.
2
Graham, Daniel A.
2
Grettler, David J.
2
Hemp, William H.
2
Heritage Philadelphia Program
2
Historic American Buildings Survey/Historic American Engineering Record
2
Independence National Historical Park (Philadelphia, Pa.)
2
International Centre for the Study of the Preservation and the Restoration of Cultural Property
2
Jackson, Joseph, 1867-1946
2
Johnson House Historic Site, Inc
2
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