Authors: R.
- Prince, Val R. - 3 books
- Driggs, Howard R. (Howard Roscoe) 1873-1963 3 books
- Shilleto, A. R. (Arthur Richard) 1848-1894 3 books
- Audubon, Maria R. (Maria Rebecca) 1843-1925 3 books
- Ballinger, Harry Russell 1892-1993 3 books
- Lander, Richard 1804-1834 3 books
- Monsell, J. R. - 3 books
- Philp, Robert Kemp 1819-1882 3 books
- Bourne, H. R. Fox (Henry Richard Fox) 1837-1909 3 books
- Stawell, R. De S. - 3 books
- Willis, Robert 1799-1878 3 books
- Smith, H. R. - 3 books
- Evans, Henry Ridgely 1861-1949 3 books
- Wellington, R. (Richard) 1884-1975 3 books
- Dickson, Gordon R. 1923-2001 3 books
- Vosburgh, R. G. - 3 books
- Knox, Ronald Arbuthnott 1888-1957 3 books
- Trowbridge, W. R. H. (William Rutherford Hayes) 1866-1938 3 books
- Havergal, Frances Ridley 1836-1879 3 books
- Newell, R. H. (Robert Henry) 1836-1901 3 books
- Starzl, Roman Frederick 1899-1976 3 books
- Ramón y Cajal, Santiago 1852-1934 3 books
- Gleig, G. R. (George Robert) 1796-1888 3 books
- Schabelitz, R. F. (Rudolph Frederick) 1884- 3 books
- Lehmann, R. C. (Rudolf Chambers) 1856-1929 2 books
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