Citation Formats

MLA

Butters, Roy Morrill. Permian Or "permo-carboniferous" of the Eastern Foothills of the Rocky Mountains In Colorado.

APA

Butters, R. Permian or "Permo-Carboniferous" of the Eastern Foothills of the Rocky Mountains in Colorado.

Chicago

Butters, Roy Morrill. Permian Or "permo-Carboniferous" of the Eastern Foothills of the Rocky Mountains In Colorado.