Authors: R.
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- Mattoon, Wilbur R. (Wilbur Reed) 1875-1941 1541 downloads
- Ottolengui, Rodrigues 1861-1937 1539 downloads
- Mellin, Robert 1826-1880 1538 downloads
- Witthaus, R. A. (Rudolph August) 1846-1915 1530 downloads
- Schabelitz, R. F. (Rudolph Frederick) 1884- 1528 downloads
- Laurence, Richard 1760-1838 1526 downloads
- Gill, A. E. R. - 1520 downloads
- Pease, Edward R. (Edward Reynolds) 1857-1955 1516 downloads
- Ignacio, Cleto R. - 1514 downloads
- Helper, Hinton Rowan 1829-1909 1509 downloads
- Knox, Ronald Arbuthnott 1888-1957 1508 downloads
- Rogers, R. Vashon (Robert Vashon) 1843-1911 1507 downloads
- Ballinger, Harry Russell 1892-1993 1503 downloads
- Burleigh, Sydney Richmond 1853-1931 1492 downloads
- Scoble, Andrew R. (Andrew Richard), Sir 1831-1916 1490 downloads
- Newell, R. H. (Robert Henry) 1836-1901 1490 downloads
- Field, Roswell Martin 1851-1919 1483 downloads
- Los Rios, R. de (Ricardo) 1846-1929 1471 downloads
- Boswell, Robert Bruce 1846-1933 1468 downloads
- Barbiera, Raffaello 1851-1934 1461 downloads
- Kloosterman, J. R. (Jan Ritskes) 1847-1914 1436 downloads
- Doede, William R. 1918-2007 1425 downloads
- Gilchrist, Murray 1868-1917 1421 downloads
- Procter, H. R. (Henry Richardson) 1848-1927 1419 downloads
- Zogbaum, Rufus Fairchild 1849-1925 1413 downloads