Authors: R.
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- Spitz, R. J. 1889-1954
- Spofford, Ainsworth Rand 1825-1908
- Stacy, John R. -
- Starzl, Roman Frederick 1899-1976
- Stawell, R. De S. -
- Stead, Richard -
- Stearns, J. N. (John Newton) 1829-1895
- Stebbing, Thomas Roscoe Rede 1835-1926
- Steele, Eliza R. -
- Steele, Richard, Sir 1672-1729
- Steffen, Mart R. (Martin Robert) 1882-
- Stephens, Robert Neilson 1867-1906
- Stephens, W. R. W. (William Richard Wood) 1839-1902
- Sterrett, Frances R. (Frances Roberta) 1869-1947
- Stevenson, Robert Alan Mowbray 1847-1900
- Stevenson, Robert Louis 1850-1894
- St. George, R. A. (Raymond Alexander) 1894-
- Stiles, Kate R. -
- Stitt, E. R. (Edward Rhodes) 1867-1948
- Stockheker, R. W. (Ralph Walter) 1908-2004
- Stockman, James R. 1915-2000
- Stockton, Frank R. 1834-1902
- Storer, Horatio Robinson 1830-1922
- Story, Robert Herbert 1835-1907
- Stott, W. R. S. (William R. S.) -