Media type: E-Article Title: A New Frog of the Genus Rana from Michoacan, Mexico Contributor: Zweifel, Richard G. imprint: JSTOR, 1957 Published in: Copeia Language: Not determined DOI: 10.2307/1439391 ISSN: 0045-8511 Keywords: Animal Science and Zoology ; Aquatic Science ; Ecology, Evolution, Behavior and Systematics Origination: Footnote: