Robert Powell
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Peterson Field Guide To Reptiles And Amphibians Eastern & Central North America: The Definitive Guide to the Reptiles and Amphibians of Eastern and Central North America
Powell, Robert; Conant, Roger; Collins, Joseph T.
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Key to the Herpetofauna of the Continental United States and Canada
Powell, Robert; Joseph T. Collins; A01
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A Key to Amphibians & Reptiles of the Continental United States and Canada
Powell, Robert; Collins, Joseph T.; Hooper, Errol D.
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