Authors: Otto
- Speckter, Otto 1807-1871 2 books
- Hultsch, Fridericus (Friedrich Otto) 1833-1906 2 books
- Henne am Rhyn, Otto 1828-1914 2 books
- Pick, Otto 1887-1940 2 books
- Trevelyan, George Otto 1838-1928 2 books
- Kotzebue, Otto von 1787-1846 2 books
- Flake, Otto 1880-1963 2 books
- Hoppé, E. O. (Emil Otto) 1878-1972 2 books
- Weininger, Otto 1880-1903 2 books
- Lütken, Otto George 1849-1906 2 books
- Witt, Otto 1875-1923 2 books
- Wenckstern, Otto von 1819-1869 2 books
- Zacharias, Otto 1846-1916 2 books
- Tuomi, Otto 1869-1930 2 books
- Tiuppa, Otto 1872-1914 2 books
- Stein, Armin 1840-1929 2 books
- Pirenne, Henri 1862-1935 2 books
- Funcke, Otto 1836-1910 1 book
- Corvin, Otto von 1812-1886 1 book
- Herman, Ottó 1835-1914 1 book
- Lang, Otto - 1 book
- Schupp, Ottokar 1834-1911 1 book
- Glaubrecht, O. (Otto) 1807-1859 1 book
- Schmeil, O. (Otto) 1860-1943 1 book
- Dornblüth, Otto 1860-1922 1 book
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