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[en] [Gutenberg 33543] • The Amphibians and Reptiles of Michoacán, México
Duellman, William Edward
[en] [Gutenberg 35413] • A Review of the Middle American Tree Frogs of the Genus Ptychohyla
[en] [Gutenberg 38440] • A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, México
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![[Gutenberg 35413] • A Review of the Middle American Tree Frogs of the Genus Ptychohyla](/cover/t7GE5khrtFA327Ag/small/[Gutenberg%2035413]%20%e2%80%a2%20A%20Review%20of%20the%20Middle%20American%20Tree%20Frogs%20of%20the%20Genus%20Ptychohyla.jpg)
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