Authors: r
- Apollonius, Rhodius -
- Appleton, R. B. (Reginald Bainbridge) 1886-1938
- Applin, R. V. K. (Reginald Vincent Kempenfeldt) 1869-1957
- Arber, Agnes Robertson 1879-1960
- Archer, Richard -1883
- Archibald, Raymond Clare 1875-1955
- Arcos, René 1880-1959
- Argentina -
- Argentina. Ministerio de Agricultura -
- Argilagos, Rafael G. (Rafael Graciano) 1885-1967
- Arkell, Reginald 1882-1959
- Armitage, Robert B. -
- Armour, Rebecca Agatha 1845-1891
- Arnault, Robert -
- Arnold, Reginald Harvey -
- Arnold, Robert -
- Arnot, Robert 1860-
- Arrighi, Cletto 1830-1906
- Arrowsmith, Robert 1860-1928
- Arr, Stephen 1921-2012
- Arthur, Frances Browne -1920
- Arthur, Richard 1865-1932
- Arthur, Robert 1909-1969
- Ascham, Roger 1515-1568
- Ashbee, C. R. (Charles Robert) 1863-1942
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