Authors: P
- Silva, Joaquim Possidónio Narciso da 1806-1896
- Silva Pinto, Antonio da 1848-1911
- Silvestre, Armand 1837-1901
- Simmonds, P. L. (Peter Lund) 1814-1897
- Simpson, Percy 1865-1962
- Simpson, Pinder -
- Sinks, Perry Wayland -
- Sinnett, A. P. (Alfred Percy) 1840-1921
- Sinués de Marco, María del Pilar 1835-1893
- Siwertz, Sigfrid 1882-1970
- Sixemonts, Pierre -
- Skinner, Harriet Pearl -
- Slatin, Rudolf Carl, Freiherr von 1857-1932
- Slaveikov, Pencho P. 1866-1912
- Smet, Pierre-Jean de 1801-1873
- Smith, Alice Prescott -
- Smith, Baxter Perry 1829-1884
- Smith, Daniel P. -
- Smith, Elizabeth Oakes Prince 1806-1893
- Smith, Erminnie A. (Erminnie Adele) 1836-1886
- Smith, Horace 1779-1849
- Smith, Logan Pearsall 1865-1946
- Smith, Mabell S. C. (Mabell Shippie Clarke) 1864-1942
- Smith, Mary P. Wells (Mary Prudence Wells) 1840-1930
- Smith, Pamela Colman 1878-1951
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