Short papers on geologic subjects: Areal geology of part of central eastern Illinois, by Howard R. Schwalb ; Prospecting for commercial sand and gravel using electrical earth resistivity, Clinton County, Illinois, by Jerry S. Dobrovolny ; Ceramic materials from magnesium-treated clays, by William D. Johns
"Short papers on geologic subjects: Areal geology of part of central eastern Illinois, by Howard R. Schwalb ; Prospecting for commercial sand and gravel using electrical earth resistivity, Clinton County, Illinois, by Jerry S. Dobrovolny ; Ceramic materials from magnesium-treated clays, by William D. Johns"@en
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