Authors: R.
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- Spiers, Richard Phené 1838-1916 1963 downloads
- Patton, David R. - 1952 downloads
- Johnston, Richard Malcolm 1822-1898 1916 downloads
- Leonard, R. M. (Robert Maynard) - 1913 downloads
- Montgomery, Rutherford G. (Rutherford George) 1896-1985 1901 downloads
- Hobson, R. L. (Robert Lockhart) 1872-1941 1888 downloads
- Scidmore, Eliza Ruhamah 1856-1928 1850 downloads
- Howard, John R. (John Raymond) 1837-1926 1844 downloads
- Thurston, Robert Henry 1839-1903 1804 downloads
- Riggs, Stephen Return 1812-1883 1791 downloads
- Adams, James R. - 1779 downloads
- Becher, Johannes Robert 1891-1958 1769 downloads
- Pease, Edward R. (Edward Reynolds) 1857-1955 1754 downloads
- Dickson, Gordon R. 1923-2001 1739 downloads
- Perés, Ramón D. (Ramón Domingo) 1863-1956 1730 downloads
- Peyser, Ethel R. (Ethel Rose) 1887-1961 1724 downloads
- Johnston, Reginald Fleming, Sir 1874-1938 1701 downloads
- Audubon, Maria R. (Maria Rebecca) 1843-1925 1696 downloads
- Marett, R. R. (Robert Ranulph) 1866-1943 1662 downloads
- Watling, Roy 1938- 1657 downloads
- Schaare, C. R. (Christian Richard) 1893-1980 1655 downloads
- Newmarch, Rosa 1857-1940 1653 downloads
- Stead, Richard - 1643 downloads
- Ramón y Cajal, Santiago 1852-1934 1630 downloads
- Scott, Robert Falcon 1868-1912 1628 downloads