00977cam a22002771 4500 gs 66000297 DLC 20260227111420.0 771019s1967 dcuab b f000 0 eng c gs 66000297 (OCoLC)3354289 U.S. Geol. Survey. Libr. AzU ISS DLC QE75 .P9 no. 540 QE681 .I5 I 19.16:540 Imlay, Ralph W. (Ralph Willard), 1908-1989. Twin Creek limestone (Jurassic) in the western interior of the United States, by Ralph W. Imlay. Washington, U.S. Govt. Print. Off., 1967. iv, 105 p. illus., maps, 16 plates. 29 cm. Geological Survey professional paper 540 Bibliography: p. 99-102. Geology West (U.S.) Geology, Stratigraphic Jurassic. Paleontology West (U.S.) Geological Survey (U.S.). Professional paper ; 540. 30268 30268