Biblioteca - Ingemmet

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Cobban, William A.

Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming - Washington, D.C. U.S. Geological Survey 1990 - 13 p. 11 láms. - U.S. Geological Survey Bulletin n.1917-B .

Subjects--Topical Terms:
AMMONOIDEA
BIVALVIA
CRETACEO

Subjects--Geographic Terms:
ESTADOS UNIDOS