00787cam a22002291a 4500 gs 65000329 DLC 20260227111417.0 810514s1965 ndub s000 0 eng gs 65000329 (OCoLC)7420042 DLC OkTCS OrPS DLC QE163 .A3 no. 14 Agnew, Allen F., 1918-2012. A Guide to the stratigraphy of South Dakota / by Allen F. Agnew and Paul C. Tychsen. Vermillion, S.D. : Science Center, University of South Dakota, 1965. 195 p. : maps ; 28 cm. Bulletin / South Dakota Geological Survey ; 14. Geology South Dakota. Tychsen, Paul C. Bulletin (South Dakota Geological Survey) ; 14. 30083 30083