Irwin, J. H.
Geology of the Paleozoic rocks, Navajo and Hopi Indian reservations, Arizona, New Mexico, and Utah / by J. H. Irwin, P. R. Stevens and M. E. Cooley. -- Washington : United States Government Printing Office, 1971 - 32 p. + map. -- (Geological Survey Professional Paper ; 521-C).
Arizona
Nuevo Mexico
Paleozoico
Rocas
Utah
552(789+791/792)"613"
Geology of the Paleozoic rocks, Navajo and Hopi Indian reservations, Arizona, New Mexico, and Utah / by J. H. Irwin, P. R. Stevens and M. E. Cooley. -- Washington : United States Government Printing Office, 1971 - 32 p. + map. -- (Geological Survey Professional Paper ; 521-C).
Arizona
Nuevo Mexico
Paleozoico
Rocas
Utah
552(789+791/792)"613"