Authors: R.
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- Surtees, Robert Smith 1805-1864 2171 downloads
- Adams, James R. - 2156 downloads
- Thurston, Robert Henry 1839-1903 2156 downloads
- Marsh, Arthur Richmond 1861-1937 2145 downloads
- Chatburn, George R. 1863-1940 2142 downloads
- Stacy, John R. - 2122 downloads
- Cruttwell, C. R. M. F. (Charles Robert Mowbray Fraser) 1887-1941 2100 downloads
- Wollaston, A. F. R. (Alexander Frederick Richmond) 1875-1930 2100 downloads
- Auguis, P. R. (Pierre René) 1786-1846 2087 downloads
- Perés, Ramón D. (Ramón Domingo) 1863-1956 2084 downloads
- Macalister, Robert Alexander Stewart 1870-1950 2077 downloads
- Tolkien, J. R. R. (John Ronald Reuel) 1892-1973 2070 downloads
- Ramón y Cajal, Santiago 1852-1934 2063 downloads
- Daggett, Rollin Mallory 1831-1901 2028 downloads
- Bourne, H. R. Fox (Henry Richard Fox) 1837-1909 2022 downloads
- Audubon, Maria R. (Maria Rebecca) 1843-1925 2015 downloads
- Laurence, Richard 1760-1838 2014 downloads
- Maulde-La-Clavière, R. de (René) 1848-1902 2010 downloads
- Magoffin, Ralph Van Deman 1874-1942 2007 downloads
- Riggs, Stephen Return 1812-1883 1980 downloads
- Trowbridge, W. R. H. (William Rutherford Hayes) 1866-1938 1977 downloads
- Becher, Johannes Robert 1891-1958 1969 downloads
- Schaare, C. R. (Christian Richard) 1893-1980 1943 downloads
- Henderson, G. F. R. (George Francis Robert) 1854-1903 1941 downloads
- Fraprie, Frank Roy 1874-1951 1901 downloads