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- Olney, Warren 1841-1921 410 downloads
- Opie, Eugene L. (Eugene Lindsay) 1873-1971 410 downloads
- Fonseca, Augusto de Oliveira Cardoso 1842-1917 409 downloads
- Lourié, Ossip 1868-1955 409 downloads
- Griffith, Farran, Okeden & Welsh - 409 downloads
- Hyde, Orson 1805-1878 408 downloads
- East, Omega G. 1920-1985 408 downloads
- Overnell, T. J. - 408 downloads
- Osborne, Thomas S. - 408 downloads
- O'Keefe, John - 407 downloads
- Merriman, Owen - 406 downloads
- Oswald, Felix L. (Felix Leopold) 1845-1906 406 downloads
- Owensby, Clenton E. 1940- 406 downloads
- Tremaine, Frederick Orlin 1899-1956 405 downloads
- Association of Official Agricultural Chemists (U.S.) - 405 downloads
- Mill, Mrs. (Jean Oliver) - 405 downloads
- Jones, Edmund O. (Edmund Osborne) 1858-1931 405 downloads
- Oosterzee, Liane van - 404 downloads
- O'Reilly, Joseph John Edward 1872- 404 downloads
- Deming, Therese O. (Therese Osterheld) 1874-1945 404 downloads
- Helkiö, Onni E. (Onni Elias) 1874-1961 403 downloads
- Susag, S. O. 1862-1952 403 downloads
- Oldham, Thomas - 403 downloads
- Bosson, Olof E. 1871- 403 downloads
- Shell Union Oil Corporation - 403 downloads