Authors: R. (sorted by quantity of books)
- Murray, R. F. (Robert Fuller) 1863-1894 2 books
- Dice, Lee R. (Lee Raymond) 1887-1977 2 books
- Weekes, R. K. (Rose Kirkpatrick) 1874-1956 2 books
- Watling, Roy 1938- 2 books
- Withington, Elizabeth R. - 2 books
- Ambedkar, B. R. (Bhimrao Ramji) 1891-1956 2 books
- Blanco-Fombona, Rufino 1874-1944 2 books
- Townsend, Raymond R. - 2 books
- Boyle, Robert 1627-1691 2 books
- Effinger, John R. (John Robert) 1869-1933 2 books
- Hopkins, R. Thurston (Robert Thurston) 1884-1958 2 books
- Nettleship, Richard Lewis 1846-1892 2 books
- Tuker, M. A. R. (Mildred Anna Rosalie) - 2 books
- Burleigh, Sydney Richmond 1853-1931 2 books
- Menel, R. - 2 books
- Martin, Helen Reimensnyder 1868-1939 2 books
- Desgenettes, R. (René) 1762-1837 2 books
- Nassau, Robert Hamill 1835-1921 2 books
- Kloosterman, J. R. (Jan Ritskes) 1847-1914 2 books
- Edmonds, Cyrus R. - 2 books
- Wheelan, Albertine Randall - 2 books
- Seton-Watson, R. W. (Robert William) 1879-1951 2 books
- Campbell, R. J. (Reginald John) 1867-1956 2 books
- Mackenzie, R. Shelton (Robert Shelton) 1809-1880 2 books
- Barbiera, Raffaello 1851-1934 2 books