"Petrology." . . "From 65 to 230 million years ago" . . "Investigations of western batholiths"@en . . "Lead-alpha ages of the Mesozoic natholiths of western North America" . . . . . . . . . . . . . . . . . . . . . . . . . . "This report concerns work done on behalf of the U.S. Atomic Energy Commission and is published with the permission of the Commission."@en . . . "Lead-alpha ages of the Mesozoic batholiths of western North America" . . . . . . . . "Lead alpha ages of the Mesozoic batholiths of western North America : investigations of western batholiths" . . . . "Lead-alpha ages of the Mesozoic batholiths of western North America"@en . "Lead-alpha ages of the Mesozoic batholiths of western North America" . . "Geological Survey (U.S.)," . . "Estratigrafía América del Norte Mesozoico." . . "Geology, Stratigraphic." . . "Geology, Stratigraphic Mesozoic." . . "North America." . . "Batolitas América del Norte." . . "Batholiths." . . "U.S. Atomic Energy Commission," . . "U.S. Atomic Energy Commission." . "Petrology North America." . . "Batholiths North America." . . "Mesozoic Geologic Period." . . . .