Authors: O
- Ogden, C. K. (Charles Kay) 1889-1957 2 books
- Ongelin, Hanna 1848-1893 2 books
- Ulfeldt, Leonora Christina, grevinde 1621-1698 2 books
- Morris, William O'Connor 1824-1904 2 books
- Osborne, William Hamilton 1873-1942 2 books
- Widtsoe, Osborne J. P. 1877-1920 2 books
- Irons, William J. (William Josiah) 1812-1883 2 books
- Anderson, Ada Woodruff 1860-1956 2 books
- Orr, M. A. (Mary Acworth) 1867-1949 2 books
- United States. Navy Department. Bureau of Ordnance - 2 books
- Ortega Rubio, Juan 1845-1921 2 books
- Foster, Olive Hyde - 2 books
- Rooke, Octavius - 2 books
- Howard, L. O. (Leland Ossian) 1857-1950 2 books
- Exquemelin, A. O. (Alexandre Olivier) 1645- 2 books
- Ready, Oliver George - 2 books
- Höcker, Oskar 1840-1894 2 books
- Horn, W. O. von 1798-1867 2 books
- Osborne, Duffield 1858-1917 2 books
- United States. Office of Civil Defense - 2 books
- Holmes, Oliver Wendell 1841-1935 2 books
- Great Britain. War Office - 2 books
- Maginn, William 1793-1842 2 books
- Kingston, Charles 1884-1944 2 books
- Ostrovsky, Aleksandr Nikolaevich 1823-1886 2 books
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