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- Ward, William (Author at Arthur Westbrook Co. (Cleveland, Ohio)) - May 26, 2020
- Vierge, Daniel 1851-1904 May 24, 2020
- Broome, John 1913-1999 May 18, 2020
- Old Humphrey 1787-1854 May 18, 2020
- Dudfield, T. Orme (Thomas Orme) 1833-1908 May 9, 2020
- Owen, Robert L. (Robert Latham) 1856-1947 May 7, 2020
- Chase, Owen 1797-1869 Apr 25, 2020
- Seemann, Otto 1825-1901 Apr 23, 2020
- Oliphant, James 1855-1921 Apr 23, 2020
- Ule, Otto 1820-1876 Apr 19, 2020
- Grover, Eulalie Osgood 1873-1958 Apr 17, 2020
- Osborne, William Hamilton 1873-1942 Apr 15, 2020
- Ollier, Edmund 1827-1886 Apr 12, 2020
- Hay, Oliver Perry 1846-1930 Apr 6, 2020
- Oelschlager, Charlotte 1898-1984 Mar 29, 2020
- United States. Office of Education - Mar 18, 2020
- Otis, Sarah Elizabeth Birdsall 1872-1940 Mar 14, 2020
- Ortt, Felix 1866-1959 Mar 8, 2020
- Oliver, Jean - Mar 7, 2020
- Owen, Helen Mildred 1894-1946 Mar 6, 2020
- United States. Forest Service. Rocky Mountain Region - Mar 4, 2020
- Association of Official Agricultural Chemists (U.S.) - Feb 20, 2020
- Murie, Olaus J. (Olaus Johan) 1889-1963 Feb 17, 2020
- Ott, Charles J. - Feb 17, 2020
- Osborn, T. Forbes - Feb 14, 2020