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Revision of North American salamanders of the genus Plethodon
- "The North American salamander genus Plethodon is today the most successful group of salamanders, for it contains more than half of the known living species of the Order Caudata. Plethodontid salamanders occupy widely varied habitats. Some are strictly aquatic cavernicoles, others live only in mountain streams, and still others, like Plethodon, are terrestrial even to the extent of depositing their eggs on land and dispensing with the aquatic larval stage."
- "Systematic study of the North American salamander genus Plethodon reveals three major groups in the genus: designated, the western Plethodons (occur in the northwestern US and adjacent to Canada), the eastern small Plethodons (four species in North america, the fifth in Jemez Mountains of New Mexico; the eastern large plethodons (east of the Rocky Mountains). The eastern large and small plethodons are more closely related to each other than either is to the western plethodons. Special emphasis has been placed on the study of geographic variation in pigmentation and segmentation characteristics of the eastern species."
- "Revision of North American salamanders of the genus Plethodon"
- "Revision of North American salamanders of the Genus Plethodon"