Authors: R.
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- Lethaby, W. R. (William Richard) 1857-1931 16164 downloads
- Douglas, Robert B. (Robert Bruce) 1848-1927 15700 downloads
- Haldane, R. B. Haldane (Richard Burdon Haldane), Viscount 1856-1928 15534 downloads
- Schoolcraft, Henry Rowe 1793-1864 15464 downloads
- Emanuel, V. R. (Victor Rousseau) 1879-1960 15391 downloads
- Matthews, Stanley R. - 14408 downloads
- Markham, Clements R. (Clements Robert), Sir 1830-1916 14326 downloads
- Russell, R. V. (Robert Vane) 1873-1915 14176 downloads
- Paul, Frank R. (Frank Rudolph) 1884-1963 13669 downloads
- Summers, Leo 1925-1985 13240 downloads
- Pennell, Elizabeth Robins 1855-1936 12251 downloads
- Sharpe, Reginald R. (Reginald Robinson) 1848-1925 12180 downloads
- Wylie, I. A. R. (Ida Alexa Ross) 1885-1959 12144 downloads
- Rodríguez, Jorge R. - 11815 downloads
- Anderson, Rasmus Björn 1846-1936 11582 downloads
- Krafft-Ebing, R. von (Richard) 1840-1902 11520 downloads
- McKenzie, R. Tait (Robert Tait) 1867-1938 11031 downloads
- J. A. R. - 10769 downloads
- Oeffinger, Rudolf 1870-1952 10592 downloads
- Thayer, Lee 1874-1973 10288 downloads
- Francé, R. H. (Raoul Heinrich) 1874-1943 9915 downloads
- Wakefield, Herbert Russell 1888-1964 9846 downloads
- Weymouth, Richard Francis 1822-1902 9560 downloads
- Utting, R. B. - 9444 downloads
- D'Anvers, N. 1844-1933 9390 downloads