Authors: R.
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- Davies, Randall 1866-1946 2158 downloads
- Kelson, Keith R. - 2154 downloads
- Wenckebach, L. W. R. (Ludwig Willem Reymert) 1860-1937 2137 downloads
- Gilbert, Robert E. 1924-1993 2121 downloads
- Audubon, Maria R. (Maria Rebecca) 1843-1925 2116 downloads
- Stacy, John R. - 2109 downloads
- Perés, Ramón D. (Ramón Domingo) 1863-1956 2107 downloads
- Adams, James R. - 2077 downloads
- Trowbridge, W. R. H. (William Rutherford Hayes) 1866-1938 2067 downloads
- Riggs, Stephen Return 1812-1883 2057 downloads
- Bourne, H. R. Fox (Henry Richard Fox) 1837-1909 2051 downloads
- Henderson, G. F. R. (George Francis Robert) 1854-1903 2042 downloads
- Swanton, John Reed 1873-1958 2037 downloads
- Hitchcock, Henry-Russell 1903-1987 2017 downloads
- Cruttwell, C. R. M. F. (Charles Robert Mowbray Fraser) 1887-1941 1974 downloads
- Schaare, C. R. (Christian Richard) 1893-1980 1971 downloads
- Preston, R. M. P. (Richard Martin Peter) 1884-1965 1935 downloads
- Glover, T. R. (Terrot Reaveley) 1869-1943 1911 downloads
- Scott, R. S. - 1910 downloads
- Boak, Arthur E. R. (Arthur Edward Romilly) 1888-1962 1908 downloads
- Fraprie, Frank Roy 1874-1951 1902 downloads
- Garnier, Robert 1544-1590 1901 downloads
- Ramón y Cajal, Santiago 1852-1934 1882 downloads
- Tuker, M. A. R. (Mildred Anna Rosalie) - 1871 downloads
- Becher, Johannes Robert 1891-1958 1857 downloads