- Poole, C. H.1
- Potiquet, Alfred.1
- Powell, John Wesley, 1834-19021
- Rand McNally and Company, engravers.1
- Ranney, Adolphus.1
- Reid, John (Publisher)1
- Robinson, Eugene1
- Roeser, C. (Charles), compiler.1
- Shaler, Nathaniel Southgate, 1841-19061
- Sherman, George E., 1810 or 1811-1
- Shockley, Ernest V. (Ernest Vivian),1878-19241
- Smith, Richard A., 1876-1963.1
- Smith, Shirley Wheeler, 1875-19591
- Snider, Luther C. (Luther Crocker),1882-19471
- Society for the Diffusion of Useful Knowledge (Great Britain)1
- Stockslager, S.M.1
- Tanner, Henry Schenck, 1786-18581
- Tarrance, James1
- Tehuantepec Railway Company1
- Trouvelot, L.1