Availability of the Herrin coal for mining in Illinois /
Colin G. Treworgy, Christopher P. Korose, and Christine L. Wiscombe.

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Limited (search only)   University of Illinois at Urbana-Champaign
Full view   University of Illinois at Urbana-Champaign
Full view   Industrial Minerals Notes No. 120 University of Illinois at Urbana-Champaign