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- Pennsylvania Railroad Technical & Historical Society. Philadelphia Chapter 1 results
- Philadelphia (Pa.). Redevelopment Authority 1 results
- Philadelphia City Planning Commission 2 results
- Philadelphia Society for Alleviating the Miseries of Public Prisons 2 results
- Poling, Kyle, 1 results
- Pompilio, Natalie, 1 results
- Pompilio, Tricia, 1975- 1 results
- Popkin, Nathaniel R., 1 results
- Poxon, Marita Krivda 1 results
- Preservation Alliance for Greater Philadelphia 3 results
- Preservation Alliance for Greater Philadelphia, 1 results
- Preservation Alliance of Greater Philadelphia 1 results
- Radisson, Inc 1 results
- Regional Performing Arts Center 1 results
- Ritter & Shay Architects 2 results
- Ritz-Carlton Philadelphia 1 results
- Roach, Hannah Benner 1 results
- Roberts, Brian (Brian Leon) 1 results
- Roosevelt Inn 1 results
- Rustad, Martha E. H. (Martha Elizabeth Hillman), 1975- 1 results
- Sands, Robert W. 1 results
- Sesqui-Centennial International Exposition Philadelphia, Pa.) 1 results
- Sinclair, Thomas S., approximately 1805-1881 1 results
- Skaler, Robert Morris 3 results
- Skeens, Matthew, 1 results
- Skiba, Bob 1 results
- Smith, M. Earl, 1 results
- Snyder, June Avery 1 results
- Snyder, Martin P. 1 results
- Snyder, Theresa R. 1 results
- Society for Alleviating the Miseries of Public Prisons (Philadelphia) 1 results
- Society for Industrial Archeology Oliver Evans Chapter 1 results
- Sommer, Richard (Richard M.) 1 results
- Spector, Gus 1 results
- Spivak, Joel 1 results
- Springfield Township Historical Society 1 results
- Staib, Walter 1 results
- Thomas, George E. 2 results
- Traub, David S. 1 results
- Traub, David S., 1 results
- United States. National Park Service 1 results
- Vaux, Trina 1 results
- Venturi, Robert 1 results
- Wagner, Phil 1 results
- Webster, J. P. (John Paul), 1 results
- Westin Hotels & Resorts 1 results
- Wheelwright, Stevenson & Langran 1 results
- Williams, Peter John 1 results
- Windsor Suites 1 results
- Woodall, Peter, 1 results more…