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- Wright, Orville 1871-1948 828 downloads
- Olmsted, Denison 1791-1859 821 downloads
- Playfair, William 1759-1823 821 downloads
- Chanute, Octave 1832-1910 820 downloads
- Bilse, Fritz Oswald 1878-1951 819 downloads
- La Marche, Olivier de -1502 819 downloads
- Jones, Owen Glynne 1867-1899 818 downloads
- Orbeck, Anders 1891- 817 downloads
- Potter, Olave M. (Olave Muriel) - 817 downloads
- Ottmann, Victor 1869-1944 817 downloads
- Delines, Michel 1851-1914 814 downloads
- Overton, William Hassell 1868- 814 downloads
- Germany. Auswärtiges Amt - 814 downloads
- Oberholtzer, Ellis Paxson 1868-1936 810 downloads
- Osborne, Thomas Mott 1859-1926 808 downloads
- Paque, Oliver 1846-1908 807 downloads
- O'Donoghue, D. J. (David James) 1866-1917 807 downloads
- Larsson, Carl 1853-1919 806 downloads
- Nuttall Ornithological Club - 806 downloads
- Ozawa - 806 downloads
- Rothert, Otto A. 1871-1956 805 downloads
- International Institute of Bibliography - 804 downloads
- Maginn, William 1793-1842 798 downloads
- Nuorteva, Väinö Albert 1889-1967 796 downloads
- Olivier, Sydney Haldane Olivier, Baron 1859-1943 795 downloads