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- Lowe, Orton 1873- 1465 downloads
- Sinding, Otto Ludvig 1842-1909 1448 downloads
- Oliveira Martins, J. P. (Joaquim Pedro) 1845-1894 1448 downloads
- Exquemelin, A. O. (Alexandre Olivier) 1645- 1443 downloads
- Oppeln-Bronikowski, Friedrich von 1873-1936 1433 downloads
- O'Malley, Austin 1858-1932 1427 downloads
- Olcott, Charles S. (Charles Sumner) 1864-1935 1424 downloads
- Ostertag, Blanche - 1413 downloads
- Ludwig, Otto 1813-1865 1412 downloads
- Ogden, Henry N. (Henry Neely) 1868- 1410 downloads
- Dixon, William Hepworth 1821-1879 1406 downloads
- Oetker, August 1862-1918 1403 downloads
- Owen, Elias - 1400 downloads
- Kline, Otis Adelbert 1891-1946 1377 downloads
- Moore, Bloomfield H., Mrs. 1824-1899 1368 downloads
- Rissanen, Santeri 1880-1939 1366 downloads
- Odum, Howard Washington 1884-1954 1360 downloads
- Wildner, Ödön 1874-1944 1355 downloads
- Hertwig, Oscar 1849-1922 1352 downloads
- Firkins, Oscar W. 1864-1932 1347 downloads
- O'Connor, T. P. (Thomas Power) 1848-1929 1347 downloads
- Oyen, Henry 1883-1921 1347 downloads
- Williams, Orlo 1883- 1340 downloads
- Campbell, Alice 1887-1976 1333 downloads
- Orbaan, Albert 1913-1983 1327 downloads