Authors: R.
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- Johnston, Richard Malcolm 1822-1898 2206 downloads
- Thurston, Robert Henry 1839-1903 2198 downloads
- Gilbert, Robert E. 1924-1993 2189 downloads
- Wollaston, A. F. R. (Alexander Frederick Richmond) 1875-1930 2185 downloads
- Wenckebach, L. W. R. (Ludwig Willem Reymert) 1860-1937 2154 downloads
- Stacy, John R. - 2133 downloads
- Adams, James R. - 2123 downloads
- Perés, Ramón D. (Ramón Domingo) 1863-1956 2118 downloads
- Bourne, H. R. Fox (Henry Richard Fox) 1837-1909 2109 downloads
- Trowbridge, W. R. H. (William Rutherford Hayes) 1866-1938 2108 downloads
- Audubon, Maria R. (Maria Rebecca) 1843-1925 2102 downloads
- Riggs, Stephen Return 1812-1883 2085 downloads
- Henderson, G. F. R. (George Francis Robert) 1854-1903 2058 downloads
- Schaare, C. R. (Christian Richard) 1893-1980 2011 downloads
- Macalister, Robert Alexander Stewart 1870-1950 2005 downloads
- Garnier, Robert 1544-1590 1993 downloads
- Glover, T. R. (Terrot Reaveley) 1869-1943 1939 downloads
- Becher, Johannes Robert 1891-1958 1925 downloads
- Preston, R. M. P. (Richard Martin Peter) 1884-1965 1921 downloads
- Ramón y Cajal, Santiago 1852-1934 1920 downloads
- Fraprie, Frank Roy 1874-1951 1912 downloads
- Scott, R. S. - 1883 downloads
- Plomer, Henry R. (Henry Robert) 1856-1928 1870 downloads
- Hitchcock, Henry-Russell 1903-1987 1865 downloads
- Koehler, S. R. (Sylvester Rosa) 1837-1900 1865 downloads