Authors: Ro
- Langland, William - 2 books
- Shufeldt, Robert W. (Robert Wilson) 1850-1934 2 books
- Kingsley, Rose Georgina 1845-1925 2 books
- Mittis - 2 books
- Hopkins, R. Thurston (Robert Thurston) 1884-1958 2 books
- Wells, Samuel R. (Samuel Roberts) 1820-1875 2 books
- Kester, Roy B. (Roy Bernard) 1882-1965 2 books
- Playfair, Nigel 1874-1934 2 books
- Christman, Robert A. (Robert Adam) 1924-2012 2 books
- Shrader, E. Roscoe (Edwin Roscoe) 1879-1960 2 books
- Robert, de Boron, active 13th century - 2 books
- Wason, Robert Alexander 1874-1955 2 books
- Eustace, Robert 1869-1943 2 books
- Roche, Charles E. (Charles Emile) 1847-1935 2 books
- Anderson, Robert Gordon 1881-1950 2 books
- Delany, Martin Robison 1812-1885 2 books
- Zhong, Rong, active 502-519 - 2 books
- Ellis, Robinson 1834-1913 2 books
- Praeger, R. Lloyd (Robert Lloyd) 1865-1953 2 books
- Gillies, R. P. (Robert Pearse) 1788-1858 2 books
- Parkman, Mary Rosetta 1875-1941 2 books
- Scott, Robert - 2 books
- Stebbing, Thomas Roscoe Rede 1835-1926 2 books
- Nathan, Robert 1894-1985 2 books
- Packard, Robert L. (Robert Lewis) 1928- 2 books
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