Authors: Otto
- Bierbaum, Otto Julius 1865-1910 1225 downloads
- Seemann, Otto 1825-1901 1128 downloads
- Wenckstern, Otto von 1819-1869 1097 downloads
- Hoppé, E. O. (Emil Otto) 1878-1972 1096 downloads
- Lachmann, Otto F. - 1066 downloads
- Ottolengui, Rodrigues 1861-1937 998 downloads
- Rothert, Otto A. 1871-1956 873 downloads
- Dhonau, Charles Otto 1886-1976 854 downloads
- Ludwig, Otto 1813-1865 848 downloads
- Presber, Rudolf 1868-1935 839 downloads
- Stein, Armin 1840-1929 768 downloads
- Geerling, O. (Otto) 1850-1930 763 downloads
- Schoenrich, Otto 1876- 742 downloads
- Herman, Ottó 1835-1914 721 downloads
- Zacharias, Otto 1846-1916 651 downloads
- Czernin von und zu Chudenitz, Ottokar Theobald Otto Maria, Graf 1872-1932 648 downloads
- Rayburn, Otto Ernest 1891-1960 596 downloads
- Flake, Otto 1880-1963 557 downloads
- Kotzebue, Otto von 1787-1846 544 downloads
- Lyy, Toivo 1898-1976 524 downloads
- Speckter, Otto 1807-1871 523 downloads
- Pick, Otto 1887-1940 523 downloads
- Pirenne, Henri 1862-1935 514 downloads
- Donner, Otto 1835-1909 503 downloads
- Wohlers, Otto K. 1893- 457 downloads
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