Author
United States. National Park Service
23
Pennsylvania Historical and Museum Commission
14
Historical Society of Pennsylvania
6
National Trust for Historic Preservation in the United States
6
Graham, Daniel A., 1948-
5
Hagley Museum and Library
5
United States. Federal Highway Administration
5
American Association for State and Local History
4
Pennsylvania Historical Commission
4
Colimore, Edward, 1950-
3
Friends of Laurel Hill Cemetery
3
Maryland Historical Trust
3
Morris County Heritage Commission (N.J.)
3
Pennsylvania. Department of Transportation
3
University of the State of New York
3
Unrau, Harlan D.
3
Beard, Lucienne
2
Bergheim, Laura, 1962-
2
Cantor, George, 1941-
2
Catholic Church Archdiocese of Philadelphia Catholic Information Center
2
Cromie, Alice
2
Cultural Heritage Research Services
2
Delaware Historic Markers Commission
2
Eleutherian Mills-Hagley Foundation
2
Fairmount Park Council for Historic Sites (Philadelphia, Pa.)
2
Fijałkowski, Paweł
2
Gadomski, Michael P.,
2
Graham, Daniel A.
2
Grettler, David J.
2
Heritage Philadelphia Program
2
Historic American Buildings Survey/Historic American Engineering Record
2
Independence National Historical Park (Philadelphia, Pa.)
2
Jackson, Joseph, 1867-1946
2
Kurjack, Dennis C.
2
Libby, Valencia
2
Moffett, Herbert N.
2
National Constitution Center (U.S.)
2
New Jersey State Planning Board
2
New Jersey. Commission on Historic Sites
2
New York Telephone Co
2
Pancoast, Charles R., 1858-
2
Parallel Design, Inc
2
Parcs Nationaux et Lieux Historiques
2
Pennsylvania Federation of Museums and Historical Organizations
2
Pennsylvania-New Jersey Historical Automobile Tour Association
2
Philadelphia Record
2
Philadelphia's Historic Neighborhood Consortium
2
Planché, J. R.
2
Proud, George D.
2
Rakowski, Stefan
2
more ...