Author
United States. National Park Service
17
Pennsylvania Historical and Museum Commission
14
National Trust for Historic Preservation in the United States
6
Hagley Museum and Library
5
Historical Society of Pennsylvania
4
American Association for State and Local History
3
Colimore, Edward, 1950-
3
Friends of Laurel Hill Cemetery
3
Morris County Heritage Commission (N.J.)
3
Pennsylvania. Department of Transportation
3
United States. Federal Highway Administration
3
University of the State of New York
3
Beard, Lucienne
2
Cantor, George, 1941-
2
Cromie, Alice
2
Cultural Heritage Research Services
2
Delaware Historic Markers Commission
2
Eleutherian Mills-Hagley Foundation
2
Fijałkowski, Paweł
2
Graham, Daniel A.
2
Heritage Philadelphia Program
2
Historic American Buildings Survey/Historic American Engineering Record
2
Independence National Historical Park (Philadelphia, Pa.)
2
Libby, Valencia
2
Moffett, Herbert N.
2
National Constitution Center (U.S.)
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 Historical Commission
2
Pennsylvania-New Jersey Historical Automobile Tour Association
2
Philadelphia's Historic Neighborhood Consortium
2
Proud, George D.
2
Rakowski, Stefan
2
Samuels, Gayle Brandow
2
Sawin, Nancy C.
2
Smith, Helene
2
Swetnam, George
2
Toogood, Anna Coxe
2
University of the State of New York. Division of Archives and History
2
Unrau, Harlan D.
2
Vrooman, John J.
2
Young, David W.
2
Albertype Co
1
Alderson, William T. 1926-
1
Alexandria Black History Museum
1
Alexandria Convention & Visitors Association (Alexandria, Va.)
1
Altoona Railroaders Memorial Museum
1
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