Mining Methods and Costs at Crystal-Victory and Minerva no.1 Fluorspar Mines of Minerva Oil co., Hardin County, Ill.
Contributors: Montgomery, G.; Daly, J.; Myslinski, F.
Series: Information circular (United States. Bureau of Mines) -- 7956
Publisher: s.n
Published: 1960
Place of publication: S.l
Language: eng
Notes: 1