Geologic investigation of roof and floor strata : longwall demonstration, Old Ben Mine no. 24 : prediction of coal balls in the Herrin coal : final technical report, part 2
Champaign, Ill, Illinois Dept. of Energy and Natural Resources, State Geological Survey Division, 1983
1983
University Library, University of Illinois Urbana Champaign
University of Illinois Urbana-Champaign
Copyright Status:
In copyright. Digitized with permission of the University of Illinois Board of Trustees. Contact digicc@library.illinois.edu for information.