Authors: Ro
- Arber, Agnes Robertson 1879-1960
- Archer, Richard -1883
- Armitage, Robert B. -
- Arnault, Robert -
- Arnold, Robert -
- Arnot, Robert 1860-
- Arrowsmith, Robert 1860-1928
- Arthur, Robert 1909-1969
- Ascham, Roger 1515-1568
- Ashbee, C. R. (Charles Robert) 1863-1942
- Atkinson, Robert 1863-1896
- Augustus, Emperor of Rome -63-14
- Austin, Robert 1895-1973
- Aveson, Robert 1847-1939
- Aycock, Roger D. 1914-2004
- Babson, Roger Ward 1875-1967
- Bacon, Robert 1860-1919
- Bacon, Roger -1294
- Baden-Powell of Gilwell, Robert Stephenson Smyth Baden-Powell, Baron 1857-1941
- Bader, Robert N. -
- Baena, Nuno 1865-1922
- Bagar, Robert C. 1899-1957
- Bailey, Roy Rutherford 1876-1929
- Baine, Rodney M. 1913-2000
- Bain, R. Nisbet (Robert Nisbet) 1854-1909
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