Geologic map of the Portal quadrangle and vicinity, Cochise County, southeast Arizona / U.S. Department of the Interior, U.S. Geological Survey ; by Harald Drewes, E.A. du Bray, and J.S. Pallister
Series Titles:
Miscellaneous investigations series ; map I-2450 Miscellaneous investigations series (Geological Survey (U.S.)) ; map I-2450.
Variant Titles:
Portal quadrangle and vicinity, Cochise County, southeast Arizona Filing title: Portal quadrangle and vicinity, Cochise County, southeast Arizona, geologic map