Authors: R. (sorted by quantity of books)
- Hall, H. R. (Harry Reginald) 1873-1930 2 books
- Effinger, John R. (John Robert) 1869-1933 2 books
- Gretton, R. H. (Richard Henry) 1874- 2 books
- Mathews, R. H. (Robert Hamilton) 1841-1918 2 books
- Brown, Charles Reynolds 1862-1950 2 books
- Seton-Watson, R. W. (Robert William) 1879-1951 2 books
- Edmonds, Cyrus R. - 2 books
- Wheelan, Albertine Randall - 2 books
- Mackenzie, R. Shelton (Robert Shelton) 1809-1880 2 books
- Kelly, R. Talbot (Robert Talbot) 1861-1934 2 books
- Barbiera, Raffaello 1851-1934 2 books
- Watson, John R. (John Reay) 1872- 2 books
- Spofford, Ainsworth Rand 1825-1908 2 books
- Wilson, Robert W. (Robert Warren) 1909-2006 2 books
- Wingate, F. R. (Francis Reginald), Sir 1861-1953 2 books
- Wells, Joseph Robert - 2 books
- Hobson, R. L. (Robert Lockhart) 1872-1941 2 books
- Praeger, R. Lloyd (Robert Lloyd) 1865-1953 2 books
- Ellis, Robinson 1834-1913 2 books
- Lee, Stanley R. -1997 2 books
- Stockheker, R. W. (Ralph Walter) 1908-2004 2 books
- Peyser, Ethel R. (Ethel Rose) 1887-1961 2 books
- Krafft-Ebing, R. von (Richard) 1840-1902 2 books
- Sempau, Ramón 1871-1909 2 books
- Mikels, Rosa Mary Redding 1862- 2 books