Names
- Pennsylvania Railroad.1
- Perry, Oliver Curtis, 1866-1930--Portraits.1
- Platt, H. M. (Henry Martin), 1835-1899.1
- Pott family1
- Robbins, Frank, 1846-1924.1
- Rockefeller, John D., III (John Davison), 1906-1978--Portraits.1
- Roebling, John A. (John Augustus), 1806-1869--Portraits.1
- Roebling, Washington Augustus, 1837-1926--Portraits.1
- Roosevelt, Theodore, 1858-1919.1
- Sage, Russell, 1816-1906.1
- Schegel, Joseph.1
- Smithsonian Institution.1
- Steinway & Sons.1
- Stephenson, George, 1781-1848--Portraits.1
- Stephenson, Robert, 1803-1859--Portraits.1
- Stephenson, Rowland, 1782-1856--Portraits.1
- Sulinkski, Joseph J.1
- Treadwell, T. K.1
- Underwood & Underwood.1
- United States Capitol (Washington, D.C.)1