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Comparison of aerial and ground surveying of subsidence over an active longwall / by John C. LaScola

By: LaScola, John C.
Contributor(s): United States. Bureau of Mines.
Material type: materialTypeLabelBookSeries: United States Bureau of Mines. Report of investigations 9214. Publisher: Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1988Description: 12 p. : ill. ; 28 cm.Report number: USBM ri-9214Subject(s): Mine subsidences -- Measurement -- Pennsylvania | Longwall mining -- Safety measures -- Pennsylvania
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Bibliography: p. 12

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