Authors: R.
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- Bell, R. S. Warren (Robert Stanley Warren) 1871-1921 1483 downloads
- Mattoon, Wilbur R. (Wilbur Reed) 1875-1941 1479 downloads
- Field, Roswell Martin 1851-1919 1478 downloads
- Rankaves, Alexandros Rizos 1809-1892 1477 downloads
- Gill, A. E. R. - 1476 downloads
- Ignacio, Cleto R. - 1473 downloads
- Burleigh, Sydney Richmond 1853-1931 1471 downloads
- Knox, Ronald Arbuthnott 1888-1957 1471 downloads
- Boswell, Robert Bruce 1846-1933 1465 downloads
- Scoble, Andrew R. (Andrew Richard), Sir 1831-1916 1464 downloads
- Helper, Hinton Rowan 1829-1909 1461 downloads
- Schabelitz, R. F. (Rudolph Frederick) 1884- 1458 downloads
- Los Rios, R. de (Ricardo) 1846-1929 1447 downloads
- Lakeland, R. - 1438 downloads
- Newell, R. H. (Robert Henry) 1836-1901 1434 downloads
- Zogbaum, Rufus Fairchild 1849-1925 1403 downloads
- Barbiera, Raffaello 1851-1934 1397 downloads
- Gilchrist, Murray 1868-1917 1396 downloads
- Cyr, Ellen M. 1860-1920 1394 downloads
- Ballinger, Harry Russell 1892-1993 1392 downloads
- Hertzberg, Rafaël 1845-1896 1379 downloads
- Buchanan, R. J. M. (Robert James McLean) 1864-1925 1368 downloads
- Rogers, R. Vashon (Robert Vashon) 1843-1911 1364 downloads
- Bolles, John R. (John Rogers) 1810-1895 1353 downloads
- Doede, William R. 1918-2007 1352 downloads