Authors: O
- Arlington Co., Va. County Manager -
- Ashmore, Otis 1853-1934
- Asquith, H. H. (Herbert Henry) 1852-1928
- Asquith, Margot 1864-1945
- Association of Official Agricultural Chemists (U.S.) -
- Astala, Onni -
- Augustus, Emperor of Rome -63-14
- Austin, Oscar P. (Oscar Phelps) -1933
- Author of the Observant pedestrian, Montrose, Mystic cottager, &c. &c. -
- Ayres, Alfred 1825-1902
- Baker, Olaf -
- Bale, John 1495-1563
- Bangs, Outram 1862-1932
- Banim, John 1798-1842
- Barfield, Owen 1898-1997
- Barker, J. Ellis 1870-1948
- Barker, M. H. (Matthew Henry) 1790-1846
- Barnes, Orange Perry 1858-1925
- Barnett, S. A., Mrs. 1851-1936
- Barrett, Orvey S. -
- Bartlett, Frederick Orin 1876-1945
- Bates, Oric 1883-1918
- Baumann, Oskar 1864-1899
- Baum, Oskar 1883-1941
- Bauriedl, Otto 1879-1961
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