Authors: R.
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- Calhoun, A. R. (Alfred Rochefort) 1844-1912 2244 downloads
- Scidmore, Eliza Ruhamah 1856-1928 2229 downloads
- Gilbert, Robert E. 1924-1993 2224 downloads
- Wenckebach, L. W. R. (Ludwig Willem Reymert) 1860-1937 2197 downloads
- Creswell, R. J. (Robert J.) 1844-1906 2190 downloads
- Johnston, Richard Malcolm 1822-1898 2182 downloads
- Davies, Randall 1866-1946 2179 downloads
- Kelson, Keith R. - 2179 downloads
- Audubon, Maria R. (Maria Rebecca) 1843-1925 2169 downloads
- Henderson, G. F. R. (George Francis Robert) 1854-1903 2140 downloads
- Riggs, Stephen Return 1812-1883 2127 downloads
- Bourne, H. R. Fox (Henry Richard Fox) 1837-1909 2109 downloads
- Burden, E. R. - 2088 downloads
- Schaare, C. R. (Christian Richard) 1893-1980 2079 downloads
- Adams, James R. - 2079 downloads
- Trowbridge, W. R. H. (William Rutherford Hayes) 1866-1938 2074 downloads
- Ramón y Cajal, Santiago 1852-1934 2064 downloads
- Plomer, Henry R. (Henry Robert) 1856-1928 2064 downloads
- Perés, Ramón D. (Ramón Domingo) 1863-1956 2056 downloads
- Cunningham, Robert Hays - 2055 downloads
- Preston, R. M. P. (Richard Martin Peter) 1884-1965 2034 downloads
- Watling, Roy 1938- 2022 downloads
- Major, Richard Henry 1818-1891 1964 downloads
- Boak, Arthur E. R. (Arthur Edward Romilly) 1888-1962 1957 downloads
- Fraprie, Frank Roy 1874-1951 1946 downloads