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000068550 1001_ $$aWier, Charles E.$$q(Charles Eugene),$$d1921-
000068550 24510 $$aFactors affecting coal roof rock in Sullivan County, Indiana /$$cCharles E. Wier.
000068550 260__ $$aBloomington, Ind. :$$bDept. of Natural Resources, Indiana Geological Survey,$$c1970.
000068550 300__ $$ap. 263-269 :$$bill. ;$$c23 cm.
000068550 500__ $$a"Reprinted from Proceedings of the Indiana Academy of Science for 1969, vol. 79, 1970."
000068550 650_0 $$aCoal mines and mining$$zIndiana$$xSafety measures.
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