Title: Geological and geophysical survey of fluorspar areas in Hardin County, Illinois
First published: 1944
Subjects: Earth resistance, Faults (Geology), Fluorspar, Geology, Geophysical methods, Geophysics, Limestone, Prospecting, Rocks, Sedimentary, Sedimentary Rocks, Sedimentation and deposition
Places: Hardin County, Illinois