A Guide to the stratigraphy of South Dakota Agnew, Allen F. 1918-2012 creator Tychsen, Paul C. text ndu Vermillion, S.D Science Center, University of South Dakota 1965 monographic eng
print
195 p. : maps ; 28 cm. by Allen F. Agnew and Paul C. Tychsen. Geology South Dakota QE163 .A3 no. 14 Bulletin (South Dakota Geological Survey) ; 14 gs 65000329 DLC 810514 20260227111417.0 gs 65000329