Authors: P
- Thieme, Hugo P. (Hugo Paul) 1870-1940
- Thijsse, Jac. P. (Jacobus Pieter) 1865-1945
- Thoma, Ludwig 1867-1921
- Thomas, A. P. W. (Algernon Phillips Withiel) 1857-1937
- Thomas, Edward 1878-1917
- Thomasson, Pehr 1818-1883
- Thomas, T. H. (Thomas Henry) 1839-1915
- Thompson, Daniel P. (Daniel Pierce) 1795-1868
- Thompson, Edward P. (Edward Pruden) -
- Thompson, L. S. (Lucy S.) 1813-1881
- Thompson, Ruth Plumly 1893-1976
- Thompson, Silvanus P. (Silvanus Phillips) 1851-1916
- Thomson, J. Pringle (James Pringle) 1889-1916
- Thomson, M. Pearson -
- Thorne, Paul -
- Thouar, Pietro 1809-1861
- Thureau-Dangin, Paul 1837-1913
- Thurn und Taxis, Marie, Princess 1855-1934
- Tideman, Pet (Pieter) 1871-1943
- Tillinghast, Pardon Elisha 1836-1905
- Tinsley, Henry C. 1834-1902
- Todd, David P. (David Peck) 1855-1939
- Todd, Mattie Phipps -
- Toland, John 1670-1722
- Tomlinson, Paul G. (Paul Greene) 1888-
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