Authors: R.
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- Craddock, Charles Egbert 1850-1922 17082 downloads
- Phipps, Ramsay Weston 1838-1923 16667 downloads
- Utting, R. B. - 16648 downloads
- Dallington, Robert 1561-1637 16252 downloads
- Elwes, R. H. M. (Robert Harvey Monro) 1853- 16196 downloads
- Krafft-Ebing, R. von (Richard) 1840-1902 15601 downloads
- Ralston, William Ralston Shedden 1828-1889 15573 downloads
- Herrick, Robert 1591-1674 15472 downloads
- Pennell, Elizabeth Robins 1855-1936 15066 downloads
- Allinson, A. R. (Alfred Richard) 1852-1929 13783 downloads
- Anderson, Rasmus Björn 1846-1936 13593 downloads
- Boyle, Robert 1627-1691 13170 downloads
- Proctor, Richard A. (Richard Anthony) 1837-1888 13034 downloads
- Paul, Frank R. (Frank Rudolph) 1884-1963 12839 downloads
- Matthews, Stanley R. - 12443 downloads
- Lander, Richard 1804-1834 12194 downloads
- Musick, John R. (John Roy) 1849-1901 12181 downloads
- Latham, R. G. (Robert Gordon) 1812-1888 12155 downloads
- Haldane, R. B. Haldane (Richard Burdon Haldane), Viscount 1856-1928 12097 downloads
- Austen-Leigh, Richard Arthur 1872-1961 11945 downloads
- Livingstone, Richard Winn, Sir 1880-1960 11659 downloads
- D'Anvers, N. 1844-1933 11075 downloads
- Vosburgh, R. G. - 10663 downloads
- Summers, Leo 1925-1985 10656 downloads
- Marcy, Randolph B. (Randolph Barnes) 1812-1887 10508 downloads