Porvenir formation (new name)--and other revisions of nomenclature of Mississippian, Pennsylvanian, and lower Permian rocks, southeastern Sangre de Cristo Mountains, New Mexico /
Baltz, Elmer Harold,1927-
Myers, Donald A.,1921-
Washington :, Alexandria, VA : U.S. G.P.O, For sale by the Branch of Distribution, U.S. Geological Survey,
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Geology, Stratigraphic
Geology, Stratigraphic