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Creator
- University of Pittsburgh16,675
- Pittsburgh City Photographer15,431
- Unknown7,800
- Trib Total Media, Inc5,927
- University of Scranton. Office of Public Relations5,787
- Zahn, Frank G., 1925-20085,296
- Mellink, Machteld J. (Machteld Johanna)3,973
- Castner, Samuel, 1843-19293,595
- Fred Wright3,209
- unknown2,831
- Morris, Marriott Canby, 1863-19482,489
- Ernest Hexamer2,367
- Dias2,128
- La Salle University2,127
- Philadelphia Museum of Art1,899
- Appleton, Stephen Horne, 1854-19091,878
- G. M. Hopkins & Co.1,807
- Rosenberg, Richard1,743
- Pittsburgh and Lake Erie Railroad Company1,594
- Villanova University.1,572