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1. Oil and gas investigations, chart OC (series). 41. Thickness and lithology of Upper Devonian and carboniferous rocks in Michigan; by George V. Cohee, Carol Macha, and Margery Hoik [with text by George V. Cohee), Washington. D. C., 1951.

Corporate/Agency Authors:: Geophysical investigations map GP (series).
Publisher:: Geophysical investigations map GP (series).
Date:: [May 1951]
SuDoc number:: I 19.25/5:41/sh.1-5

2. Oil and gas investigations, chart OC (series). 42. Subsurface geologic cross sections of Mesozoic rocks in northeastern Colorado; by Robert W. Blair [with text and references].

Corporate/Agency Authors:: Geophysical investigations map GP (series).
Publisher:: Geophysical investigations map GP (series).
Date:: 1951
SuDoc number:: I 19.25/5:42/sh.1,2