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Browse Illinois Mining Investigations - Illinois State Geological Survey by Author "Hursh, Ralph Kent"
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Browse Illinois Mining Investigations - Illinois State Geological Survey by Author
Browse Illinois Mining Investigations - Illinois State Geological Survey by Author "Hursh, Ralph Kent"
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Tests on clay materials available in Illinois coal mines.
Stull, Ray Thomas; Hursh, Ralph Kent
(
Urbana, Illinois State Geological Survey, University of Illinois,
,
1917
)
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Now showing items 1-1 of 1