Authors: Ro
- Marvin, Frederic Rowland 1847-1918 2 books
- Rogers, Will 1879-1935 2 books
- Rollin, Charles 1661-1741 2 books
- Lobo, Francisco Rodrigues 1580-1622 2 books
- Lehmann, Rosamond 1901-1990 2 books
- Roschier, Tekla 1870-1928 2 books
- Quick, Robert Hebert 1831-1891 2 books
- Mathews, R. H. (Robert Hamilton) 1841-1918 2 books
- West, Erkki 1857-1934 2 books
- Rotch, Abbott Lawrence 1861-1912 2 books
- Raban 1795-1870 2 books
- Gustavson, Lealand 1899-1966 2 books
- Le Row, Caroline B. (Caroline Bigelow) 1843- 2 books
- Rothman, Milton A. 1919-2001 2 books
- Rudder, Robert S. - 2 books
- Ross, John, Sir 1777-1856 2 books
- Wilson, Robert W. (Robert Warren) 1909-2006 2 books
- Munro, Robert 1835-1920 2 books
- Koehler, S. R. (Sylvester Rosa) 1837-1900 2 books
- Van Bergen, R. (Robert) - 2 books
- Carmichael, R. D. (Robert Daniel) 1879-1967 2 books
- Berry, R. L. (Robert Lee) 1874-1952 2 books
- Edwards, Robert 1879-1948 2 books
- Roth, Herb 1887-1953 2 books
- Helper, Hinton Rowan 1829-1909 2 books
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