01061cam a22002891 4500 gs 42000164 DLC 20260227111347.0 790612r1942uuuusdua b s000 0 eng gs 42000164 (OCoLC)5056307 DLC TxCM DLC premarc QC825.1.U8 S84 Tullis, Edward Langdon, 1908- Magnetometer surveys during 1941, by Edward L. Tullis. Vermillion, S.D., University of South Dakota, 1942. 40 p. illus. South Dakota. State Geological Survey. Report of investigations, no. 42 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. Geomagnetism South Dakota. Prospecting. Petroleum Geology. Report of investigations (South Dakota Geological Survey) ; no. 42. 27800 27800