Authors: R.
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- Thurston, Robert Henry 1839-1903 2204 downloads
- Johnston, Richard Malcolm 1822-1898 2197 downloads
- Gilbert, Robert E. 1924-1993 2187 downloads
- Swanton, John Reed 1873-1958 2180 downloads
- Wenckebach, L. W. R. (Ludwig Willem Reymert) 1860-1937 2146 downloads
- Stacy, John R. - 2144 downloads
- Audubon, Maria R. (Maria Rebecca) 1843-1925 2128 downloads
- Perés, Ramón D. (Ramón Domingo) 1863-1956 2126 downloads
- Adams, James R. - 2120 downloads
- Bourne, H. R. Fox (Henry Richard Fox) 1837-1909 2098 downloads
- Trowbridge, W. R. H. (William Rutherford Hayes) 1866-1938 2096 downloads
- Riggs, Stephen Return 1812-1883 2082 downloads
- Henderson, G. F. R. (George Francis Robert) 1854-1903 2052 downloads
- Schaare, C. R. (Christian Richard) 1893-1980 2024 downloads
- Glover, T. R. (Terrot Reaveley) 1869-1943 1952 downloads
- Garnier, Robert 1544-1590 1944 downloads
- Cruttwell, C. R. M. F. (Charles Robert Mowbray Fraser) 1887-1941 1937 downloads
- Preston, R. M. P. (Richard Martin Peter) 1884-1965 1932 downloads
- Becher, Johannes Robert 1891-1958 1928 downloads
- Fraprie, Frank Roy 1874-1951 1921 downloads
- Ramón y Cajal, Santiago 1852-1934 1919 downloads
- Scott, R. S. - 1908 downloads
- Creswell, R. J. (Robert J.) 1844-1906 1900 downloads
- Hitchcock, Henry-Russell 1903-1987 1876 downloads
- Boak, Arthur E. R. (Arthur Edward Romilly) 1888-1962 1874 downloads