Authors: O
- O'Reilly, Charles William - 765 downloads
- Ogilvie, Campbell Patrick - 761 downloads
- Orwig, Louise - 759 downloads
- Nuttall Ornithological Club - 754 downloads
- O'Donoghue, Power, Mrs. 1858- 752 downloads
- Paque, Oliver 1846-1908 742 downloads
- Osborne, David, Mrs. (Fanny) - 742 downloads
- O'Donoghue, D. J. (David James) 1866-1917 742 downloads
- Olcott, William Tyler 1873-1936 741 downloads
- Horn, W. O. von 1798-1867 737 downloads
- Wegelin, Oscar 1876-1970 733 downloads
- Morris, William O'Connor 1824-1904 732 downloads
- Osler, Edward 1798-1863 727 downloads
- Stein, Armin 1840-1929 724 downloads
- Asquith, H. H. (Herbert Henry) 1852-1928 719 downloads
- Oldmixon, Mr. (John) 1673-1742 714 downloads
- O'Keeffe, John 1747-1833 712 downloads
- Orbaan, Albert 1913-1983 711 downloads
- Germany. Auswärtiges Amt - 711 downloads
- Mousley, Edward O. (Edward Opotiki) 1886- 709 downloads
- Ayres, Alfred 1825-1902 708 downloads
- Hyltén-Cavallius, Gunnar Olof 1818-1889 706 downloads
- Stevenson, O. J. 1869-1950 702 downloads
- United States. Navy Department. Bureau of Ordnance - 700 downloads
- Anderson, Ada Woodruff 1860-1956 700 downloads
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