Authors: 1920
- Chabot, Alphonse 1841-1920 2 books
- Gamble, Eliza Burt 1841-1920 2 books
- Keményffi, Jenő 1875-1920 2 books
- Schierbrand, Wolf von 1851-1920 2 books
- Southard, Elmer Ernest 1876-1920 2 books
- Widtsoe, Osborne J. P. 1877-1920 2 books
- Chapman, John L. (John Leslie) 1920- 2 books
- Hardy, E. J. (Edward John) 1849-1920 2 books
- Sidgwick, Arthur 1840-1920 2 books
- Walters, Harry McDonald 1863-1920 2 books
- Gener, Pompeyo 1848-1920 2 books
- Venable, William Henry 1836-1920 2 books
- Perris, G. H. (George Herbert) 1866-1920 2 books
- Costa, Fernandes 1848-1920 2 books
- Gordon, Hanford Lennox 1836-1920 2 books
- Stuck, Hudson 1863-1920 2 books
- Bolanden, Conrad von 1828-1920 2 books
- Barnes, Hiram P. (Hiram Putnam) 1857-1920 2 books
- Munro, Robert 1835-1920 2 books
- Cyr, Ellen M. 1860-1920 2 books
- Coppens, Charles 1835-1920 2 books
- Senior, William 1838-1920 2 books
- Bright, J. Franck (James Franck) 1832-1920 2 books
- Rhead, G. Woolliscroft (George Woolliscroft) 1854-1920 2 books
- Rickards, Edwin Alfred 1872-1920 2 books
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