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Hylbert
Hylbert
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Hylbert
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Delineation of geologic roof hazards in selected coal beds in eastern Kentucky--with Landsat imagery studies in eastern Kentucky and the Dunkard Basin. Open file report (final), 12 Dec 77-12 Sep 80
Hylbert
Published in 1980.
Developing geological structural criteria for predicting unstable mine roof rocks. Final contract report
Hylbert
Published in 1977.
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