A quarter century of mineral production,
Rothrock, E. P. 1889-1977.
A quarter century of mineral production, by E. P. Rothrock. - Vermillion, South Dakota, University of South Dakota, 1932. - 55 l. illus. - South Dakota Geological Survey. Report of investigations, no. 13 . - Report of investigations (South Dakota Geological Survey) ; no. 13. .
At head of title: South Dakota State Geological Survey, E. P. Rothrock, State Geologist. Reproduced from type-written copy.
gs 33000056
Mines and mineral resources--South Dakota.
TN24.S8 / R62
A quarter century of mineral production, by E. P. Rothrock. - Vermillion, South Dakota, University of South Dakota, 1932. - 55 l. illus. - South Dakota Geological Survey. Report of investigations, no. 13 . - Report of investigations (South Dakota Geological Survey) ; no. 13. .
At head of title: South Dakota State Geological Survey, E. P. Rothrock, State Geologist. Reproduced from type-written copy.
gs 33000056
Mines and mineral resources--South Dakota.
TN24.S8 / R62