Robert L. Usinger
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Sierra Nevada Natural History (California Natural History Guides) (Volume 73)
Storer, Tracy I.; Usinger, Robert L.; Lukas, David
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Sierra Nevada Natural History: An Illustrated Handbook
Tracy I. Storer; Robert L. Usinger
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General zoology
Tracy Irwin Storer; Robert L. Usinger
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Elements of Zoology
Usinger, Robert L.; Nybakken, James W.; Stebbins, Robert C.
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The naturalist on the River Amazons; (Everyman's library, 446)
Bates, Henry Walter
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