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- Opie, Eugene L. (Eugene Lindsay) 1873-1971 409 downloads
- Tremaine, Frederick Orlin 1899-1956 408 downloads
- Laurent, d'Orléans, active 1279 - 407 downloads
- Shepard, Odell 1884-1967 406 downloads
- Oxford graduate - 406 downloads
- David, L.-O. (Laurent-Olivier) 1840-1926 406 downloads
- Obiols Delgado, Mariano -1911 405 downloads
- United States. Forest Service. Rocky Mountain Region - 404 downloads
- Curon, L. O. - 404 downloads
- Fagan, James O. (James Octavius) 1859- 404 downloads
- Stull, Bertram O. - 404 downloads
- Cook, O. F. (Orator Fuller) 1867-1949 403 downloads
- Oldham, Thomas - 403 downloads
- Levine, Carl Oscar - 402 downloads
- Flæten, O. - 400 downloads
- Owensby, Clenton E. 1940- 400 downloads
- Goetz, Oswald 1896-1960 400 downloads
- Ogden, Herbert G. (Herbert Gouverneur) 1846-1906 400 downloads
- Gnocchi-Viani, Osvaldo 1837-1917 400 downloads
- Rolfe, Maro O. (Maro Orlando) 1852-1925 399 downloads
- Sommer, H. Oskar (Heinrich Oskar) 1861- 399 downloads
- Poli, Oscar de (Philippe François Joseph) 1838-1908 399 downloads
- Bale, John 1495-1563 399 downloads
- Oldfather, W. A. (William Abbott) 1880-1945 399 downloads
- Old Elizabeth 1766- 399 downloads