Alexander von Humboldt
Kokuritsu Kokkai Toshokan (Japan)
United States. General Accounting Office
Bryan Edwards
Estelle Levetin
Natural Resources Management Center (Philippines)
William Rhind
S. L. Kochhar
Beryl Brintnall Simpson
George Watt
B. B. Simpson
Jean Baptiste Pierre Antoine de Monet de Lamarck
H. M. Burkill
Alphonse de Candolle
Nelson Coon
Henry Hobhouse
Paul Hawken
Unknown Author
John Stuart Mill
David Prescott Barrows