Books by Ky.) Forum on Geology of Industrial Minerals (9th : 1973 : Paducah:
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Forum on Geology of Industrial Minerals (9th : 1973 : Paducah, Ky.): A geologic excursion to fluorspar mines in Hardin and Pope Counties, Illinois; Illinois-Kentucky mining district and adjacent Upper Mississippi Embayment (Illinois State Geological Survey, 1973), also by Norman C. Hester, James C. Bradbury, and James W. Baxter (page images at HathiTrust)
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