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- Morgan, Dayton S. 1 results
- National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.) 1 results
- Navin, Thomas R. 1 results
- Newcomen Society of the United States 2 results
- Pennsylvania Agricultural Works (York, Pa.) 1 results
- Philadelphia Bourse 1 results
- Philadelphia Record 11 results
- Philadelphia War Photograph Committee (Pa.) 1 results
- Philadelphia War Photograph Committee : Henry C. Howland, International Film Service, J.E. Green, J.W. Replogle, Harry Gruber 1 results
- Potts, William McCleery, 1856- 1 results
- Pound, Arthur, 1884-1966 1 results
- Ransome Concrete Machinery Co 1 results
- Rau, William Herman, 1855-1920 1 results
- Rees, Jonathan, 1966- 1 results
- Replogle, J.W., photographer 1 results
- Rochester Agricultural Works (Rochester, N.Y.) 1 results
- Rodenhausen's Excelsior Wagon Work Business Records 1 results
- Rogin, Leo, 1893- 1 results
- Rupp, Warren E. 1 results
- Schaffer, Erv 1 results
- Scott and Van Altena Company 1 results
- Seaton, Chas. W. (Charles William), 1831-1885 1 results
- Sellers, Coleman, 1781-1834 1 results
- Sellers, George Escol 1 results
- Seward, William H. (William Henry), 1801-1872 1 results
- Seymour, William H., active 19th century 1 results
- Shank, Michael W. 1 results
- Silver, Rollo G. (Rollo Gabriel), 1909-1989 1 results
- Smith, William Wikoff 1 results
- Socialist Society, USA 1 results
- Spangler Manufacturing Co. (York, Pa.) 1 results
- Speece, Glenn Harrison 1 results
- Stabler, E. (Edward), 1794-1883 1 results
- State Historical Society of Wisconsin 1 results
- Stern, Boris, 1892- 1 results
- Sutcliffe, J. V. (John V.) 1 results
- Swift, R. B. (Rodney B.) 1 results
- Thompson, Sanford Eleazer, 1867- 1 results
- Thwaites, Reuben Gold, 1853-1913 1 results
- Trowbridge, W. P. (William Petit), 1828-1892 1 results
- United States Census Office 10th census, 1880 1 results
- United States Circuit Court 1 results
- United States. Bureau of Labor Statistics 2 results
- United States. Bureau of Mines 1 results
- Walker, Francis Amasa, 1840-1897 1 results
- Westaway, C. R. 1 results
- William Sellers & Co. (Philadelphia) 1 results
- Woodward & Lothrop 1 results