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Ottmar Mergenthaler, German-American Inventor
Rights Managed 
Ottmar Mergenthaler, German-American Inventor
Rights Managed 
William Hornaday, American Conservationist
Royalty Free 
Mating male tsetse fly with tracking powder and biocide
Rights Managed 
Tsetse fly research specimen
Rights Managed 
William T. Hornaday, American Conservationist
Rights Managed 
William Bowman, English Anatomist and Histologist
Rights Managed 
William Bowman, English Anatomist and Histologist
Rights Managed