The geology of Grant county, South Dakota Rothrock, E. P. (Edgar Paul) 1889-1977 creator text sdu Vermillion, S.D University of South Dakota 1934 monographic eng
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3 p. l., 40 numb. l. incl. tables. maps (1 fold.) diagr., profiles. 28 cm. by E. P. Rothrock. At head of title: South Dakota State Geological Survey, E. P. Rothrock, state geologist ... Folded map laid in. Reproduced from type-written copy. Geology South Dakota Grant County QE164.G7 R6 557.83 South Dakota. State Geologist. Report of investigations, no. 20 gs 34000108 U.S. Geol. Survey. Library 790612 20260227111338.0 gs 34000108