Authors: R.
- Dana, Richard Henry 1815-1882 6 books
- Gilbert, Robert E. 1924-1993 6 books
- Streatfeild, R. A. (Richard Alexander) 1866-1919 6 books
- Peary, Robert E. (Robert Edwin) 1856-1920 6 books
- Sheridan, Richard Brinsley 1751-1816 6 books
- Alger, William Rounseville 1822-1905 6 books
- Griswold, Rufus W. (Rufus Wilmot) 1815-1857 6 books
- Hertzberg, Rafaël 1845-1896 5 books
- Kloosterman, J. R. (Jan Ritskes) 1847-1914 5 books
- Pritchett, R. T. (Robert Taylor) 1828-1907 5 books
- Biggs, Charlotte -1827 5 books
- Raspe, Rudolf Erich 1737-1794 5 books
- Lydekker, Richard 1849-1915 5 books
- Carling, John R. - 5 books
- Davis, Rebecca Harding 1831-1910 5 books
- Montgomery, Rutherford G. (Rutherford George) 1896-1985 5 books
- Cram, Ralph Adams 1863-1942 5 books
- Rowley, William - 5 books
- Becher, Johannes Robert 1891-1958 5 books
- Busk, Rachel Harriette 1831-1907 5 books
- Green, Alice Stopford 1848-1929 5 books
- Morris, Richard 1833-1894 5 books
- Auguis, P. R. (Pierre René) 1786-1846 5 books
- Schaare, C. R. (Christian Richard) 1893-1980 5 books
- Mellin, Robert 1826-1880 5 books
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