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- Omar Khayyam 1048-1122 11525 downloads
- Okey, Thomas 1852-1935 11309 downloads
- Marden, Orison Swett 1848-1924 11218 downloads
- Osgood, Charles Grosvenor 1871-1964 11113 downloads
- Lillibridge, Will 1878-1909 10636 downloads
- Stoddard, William O. 1835-1925 10468 downloads
- Opper, Frederick Burr 1857-1937 10455 downloads
- Feuillet, Octave 1821-1890 10257 downloads
- Oxley, J. Macdonald (James Macdonald) 1855-1907 10121 downloads
- Miller, John O. - 9678 downloads
- O'Brien, Charlotte Grace 1845-1909 9610 downloads
- Overton, Grant M. (Grant Martin) 1887-1930 9556 downloads
- Brownson, Orestes Augustus 1803-1876 9361 downloads
- Lodge, Oliver, Sir 1851-1940 9227 downloads
- Oeffinger, Rudolf 1870-1952 9119 downloads
- Onerva, L. 1882-1972 9112 downloads
- Jahn, Otto 1813-1869 8971 downloads
- Harper, Olive 1842-1915 8922 downloads
- Eadie, Eleanor Osborn 1880-1956 8707 downloads
- Dargan, Olive Tilford 1869-1968 8674 downloads
- Ochoa, Enrique - 8642 downloads
- O'Neill, Eugene 1888-1953 8502 downloads
- Herzl, Theodor 1860-1904 8477 downloads
- Lyons, Oscar W. - 8477 downloads
- Orr, Monro S. 1874-1955 8354 downloads