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- Barnes, Orange Perry 1858-1925 450 downloads
- Odell, E. G. 1886-1929 449 downloads
- Ogilvy, Maud - 449 downloads
- Olin, Richard 1934- 449 downloads
- Oakland (Calif.). Board of Education - 449 downloads
- Curling, H. Onslow (Henry Onslow) 1832-1888 448 downloads
- Hawthorne, Hildegarde 1871-1952 448 downloads
- O'Keefe, John - 447 downloads
- Lashin, Orrie - 447 downloads
- Ortega y Frías, Ramón 1825-1883 447 downloads
- Schöbl, Otto - 447 downloads
- Jacobs, Orange 1827-1914 447 downloads
- Association of Official Agricultural Chemists (U.S.) - 446 downloads
- Sjögren, Otto 1844-1917 446 downloads
- Oliphant, James 1855-1921 445 downloads
- O'Meara, James 1825-1903 444 downloads
- Ormsbee, J. - 444 downloads
- Murray, Charles Oliver 1842-1923 444 downloads
- Walzel, Oskar F. (Oskar Franz) 1864-1944 443 downloads
- Mary Agnes, Sister, O.S.B. - 443 downloads
- Anderton, H. Orsmond (Howard Orsmond) 1861-1934 443 downloads
- Gouges, Olympe de 1748-1793 442 downloads
- Oliphant, Samuel Grant 1864-1936 442 downloads
- Opie, John 1761-1807 442 downloads
- Olson, Storrs L. 1944-2021 442 downloads