Authors: F.
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- Sanborn, F. B. (Franklin Benjamin) 1831-1917
- Sánchez, Francisco -
- Sanders, William Francis Lewis 1849-
- Sanford, John F. A. 1806-1857
- Sarmiento, Domingo Faustino 1811-1888
- Saunders, Charles Francis 1859-1941
- Saxby, C. F. Argyll -
- Schabelitz, R. F. (Rudolph Frederick) 1884-
- Schaeffer, Charles Frederick 1807-1879
- Scharff, R. F. (Robert Francis) 1858-1934
- Schauffler, A. F. (Adolphus Frederick) 1845-1919
- Schell, Frank Cresson 1857-1942
- Schell, Frederic B. -
- Scheltema, J. F. (Johann Friedrich ) 1855-1922
- Scheurleer, Daniel François 1855-1927
- Schiefner, Anton 1817-1879
- Schiller, F. C. S. (Ferdinand Canning Scott) 1864-1937
- Schimper, A. F. W. (Andreas Franz Wilhelm) 1856-1901
- Schlitte, F. -
- Schmeckebier, Laurence Frederick 1877-1959
- Schmied, François-Louis 1873-1941
- Schneegans, F. Ed. (Friedrich Edward) 1867-1942
- Schneider, Norris F. (Norris Franz) 1898-1993
- Scholz, R. F. (Richard Frederick) -
- Schook, F. De Forest 1872-1942