GEOLOGICAL AND GEOPHYSICAL SURVEY OF FLUORSPAR AREAS IN HARDIN COUNTY, ILLINOIS. PART I: GEOLOGY OF THE CAVE IN ROCK DISTRICT. PART II: AN EXPLORATORY STUDY OF FAULTS IN THE CAVE IN ROCK AND ROSICLARE DISTRICTS BY THE EARTH-RESISTIVITY METHOD
Currier, L. W. & Hubbert, M. King
From Jim Hodgson Books, Churchton, MD, U.S.A.
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