Authors: spies
- Spiers, Richard Phené 1838-1916
- Spiess, Moritz 1820-1897
- Spilker, Louise -
- Spillan, D. (Daniel) -1854
- Spillane, Richard -
- Spillman, Joseph 1842-1905
- Spilman, Jonathan E. 1812-1896
- Spinden, Herbert Joseph 1879-1967
- Spindler, Carl 1796-1855
- Spindler, Karl 1887-1951
- Spingarn, Joel Elias 1875-1939
- Spink, Henry -1943
- Spinners' Club -
- Spinoza, Benedictus de 1632-1677
- Spinrad, Norman 1940-
- Spiridonov, V. S. (Vasilii Spiridonovich) 1878-1952
- Spiro, Mario 1883-1960
- Spitz, R. J. 1889-1954
- Spitzweg, Karl 1808-1885
- Spivak, John L. (John Louis) 1897-1981
- Twain, Mark (Spirit) 1835-1910
- University of Pennsylvania. Seybert Commission for Investigating Modern Spiritualism -
- Ward, Leslie, Sir 1851-1922
- Zobeltitz, Hanns von 1853-1918
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