Authors: O
- Walters, L. D'O. (Lettice D'Oyly) 1880- 342 downloads
- Anderton, H. Orsmond (Howard Orsmond) 1861-1934 342 downloads
- Boothe, Charles Octavius 1845-1924 341 downloads
- Baker, Olaf - 340 downloads
- Panizza, Oskar 1853-1921 339 downloads
- Montorgueil, Georges 1857-1933 338 downloads
- Stieglitz, Julius 1867-1937 338 downloads
- Bunnell, Otis Gridley 1868-1929 337 downloads
- Witte, Otto A. - 336 downloads
- Edmondson, G. C. 1922-1995 336 downloads
- Lock, H. O. (Henry Osmond) 1879- 335 downloads
- Osborn, H. S. (Henry Stafford) 1823-1894 335 downloads
- Howes, S. O. (Silas Orrin) 1867-1918 333 downloads
- Association of Official Agricultural Chemists (U.S.) - 333 downloads
- O'Malley, Charles Donald - 333 downloads
- Kildare, Owen 1864-1911 333 downloads
- Girondo, Oliverio 1891-1967 333 downloads
- O'Hagan, Anne 1869-1934 331 downloads
- Coomes, Oll 1845-1921 330 downloads
- Canadian War Records Office - 329 downloads
- Bangs, Outram 1862-1932 329 downloads
- Osborne, Carolyn M. - 328 downloads
- Jordan, Edwin O. (Edwin Oakes) 1866-1936 328 downloads
- Orléans, Henri d', Prince 1867-1901 328 downloads
- Cunliffe-Owen, Marguerite 1859-1927 327 downloads
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