Spelling suggestions: "subject:"line subsidence -- appalachian 1region"" "subject:"line subsidence -- appalachian 5ªregion""
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The prediction of surface subsidence due to room and pillar mining in the Appalachian coalfieldHasenfus, Gregory J. January 1984 (has links)
M. S.
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The prediction of surface subsidence due to room and pillar mining in the Appalachian coalfieldHasenfus, Gregory J. January 1984 (has links)
M.S.
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