Magnetometer surveys during 1941 - Tullis, Edward Langdon, 1908- (Vermillion, S.D., University of South Dakota, 1942)
At head of title: State of South Dakota, Harlan J. Bushfield, Governor. State Geological Survey, E. P. Rothrock, State Geologist.
Reproduced from type-written copy.
"References": p. 30.
Keywords: Geomagnetism -- South Dakota; Prospecting; Petroleum -- Geology