Authors: R.
- Ashworth, T. R. (Thomas Ramsden) 1864-1935
- Aspelin, J. R. (Johan Reinhold) 1842-1915
- Atkinson, Robert 1863-1896
- Audibert, P. Raymond (Paul Raymond) 1858-1919
- Audubon, Maria R. (Maria Rebecca) 1843-1925
- Auguis, P. R. (Pierre René) 1786-1846
- Austen-Leigh, Richard Arthur 1872-1961
- Austin, Robert 1895-1973
- Backscheider, Paula R. 1943-
- Bacon, John R. (John Reuben) 1866-1947
- Baden-Powell of Gilwell, Robert Stephenson Smyth Baden-Powell, Baron 1857-1941
- Bain, R. Nisbet (Robert Nisbet) 1854-1909
- Baker, Albert Rufus 1858-1911
- Baker, A. R. (Abijah Richardson) 1805-1876
- Baker, R. G. (Robert George) 1788-1878
- Baldwin, Gerald R. (Gerald Robert) 1868-1942
- Ballantyne, R. M. (Robert Michael) 1825-1894
- Ballinger, Harry Russell 1892-1993
- Barbiera, Raffaello 1851-1934
- Barbour, Ralph Henry 1870-1944
- Barlow, A. R. (Albert Rowe) 1841-1913
- Barlow, R. H. (Robert Hayward) 1918-1951
- Barnard, M. R. (Mordaunt Roger) 1828-1906
- Barnes, Charles R. -
- Barnes, Robert 1840-1895
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