Multiple-Shift Mechanical Mining in some Bituminous-Coal Mines: Progress Report 4. Extraction of Pillars with Mechanized Equipment

Author: Toenges, Albert L.
Additional Authors: Maize, Earl R.
Year: 1942
Document Type: N/A
SUDOC: I 28.27:7223
Series: Information circular (United States. Bureau of Mines)
Report Number: I. C. 7223
Subjects: Bituminous coal industry -- United States.
Coal-mining machinery.
Link: http://digital.library.unt.edu/ark:/67531/metadc67021/

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