Vandenhoeck & Ruprecht (1735-)(21)
Ames, Joseph Sweetman (1864-1943)(14)
Darwin, Charles (1809-1882)(13)
Hooker, Joseph Dalton (1817-1911)(13)
Johns Hopkins University (1876-)(13)
Dall, William Healey (1845-1927)(7)
Rutherford, Ernest (1871-1937)(7)
Smithsonian Institution (Washington) (1846-)(7)