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1
Concepcion and Palma Escrita Formations, western Puerto Rico /
by McIntyre, David H.
Washington : U.S. Govt. Print. Off., 1974

Government Document Book
2
Stratigraphy and potassium-argon ages of some Tertiary tuffs from Lander and Churchill counties, central Nevada /
by McKee, Edwin H.
Washington : U.S. Govt. Print. Off., 1971

Government Document Book
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