Authors: d
- Arfstrom, Jon 1928-2015
- Argens, Jean-Baptiste de Boyer, marquis d' 1704-1771
- Argentina. Ministerio de Agricultura -
- Argyll, John Douglas Sutherland Campbell, Duke of 1845-1914
- Aria, Mrs. (Eliza Davis) 1866-1931
- Arias, Francisco Gavino de -1808
- Arlen, Michael 1895-1956
- Armour, G. D. (George Denholm) 1864-1949
- Army War College (U.S.) -
- Arnold, C. D. (Charles Dudley) 1844-1927
- Arriaga, Manuel de 1840-1917
- Arriaza, Juan Bautista 1770-1837
- Arroyo de la Cuesta, Felipe 1780-1842
- Arseven, Celâl Esad 1876-1972
- Arvey, M. Dale (Martin Dale) 1915-1979
- Arvidson, Linda 1884-1949
- Ashby, Richard -
- Ashe, E. D. (Edward David) 1813-1895
- Ashford, Daisy 1881-1972
- Askew, Alice 1874-1917
- Association for Promoting the Discovery of the Interior Parts of Africa -
- Astley, Hubert D. 1860-1925
- Atkins, Smith D. (Smith Dykins) 1836-1913
- Atwood, Ellis D. (Ellis Dexter) 1889-1950
- Auber, D. F. E. (Daniel François Esprit) 1782-1871
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