Authors: R. (sorted by popularity)
- Moulton, Forest Ray 1872-1952 215 downloads
- Ainsworth, Ralph Bignell, Sir 1875-1952 213 downloads
- Blaney, Henry R. 1855-1913 213 downloads
- Fletcher, R. A. - 213 downloads
- Tenreiro, Ramón María 1879-1939 211 downloads
- Dabney, Robert Lewis 1820-1898 211 downloads
- Westall, Richard 1765-1836 210 downloads
- Monsell, J. R. - 210 downloads
- Delany, Samuel R. 1942- 209 downloads
- Stawell, R. De S. - 207 downloads
- McKenna, Richard 1913-1964 205 downloads
- Tombs, Robert Charles 1842-1923 204 downloads
- Montalba, Anthony R. (Anthony Reubens) - 203 downloads
- Punnett, Reginald Crundall 1875-1967 202 downloads
- Hercat 1843-1914 200 downloads
- Goodwin, Philip R. 1881-1935 200 downloads
- Mackenzie, R. Shelton (Robert Shelton) 1809-1880 198 downloads
- Heizer, Robert F. (Robert Fleming) 1915-1979 198 downloads
- Zirker, Malvin R. - 198 downloads
- Cohen, Morris R. (Morris Raphael) 1880-1947 196 downloads
- Hawker, Robert Stephen -1875 196 downloads
- Brown, Charles Reynolds 1862-1950 196 downloads
- Lydekker, Richard 1849-1915 195 downloads
- Van Millingen, Julius R. - 195 downloads
- Llull, Ramon -1316 195 downloads