Two-leg longwall shield mechanics

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Bibliographic Details
Main Author: Barczak, Thomas M.
Corporate Author: United States. Bureau of Mines
Other Authors: Schwemmer, David E.
Format: Government Document Microfilm Book
Language:English
Published: Pittsburgh, PA. : U.S. Dept. of the Interior, Bureau of Mines, 1989.
Series:Report of investigations (United States. Bureau of Mines) ; 9220.
Physical Description:
ii, 34 pages : illustrations ; 28 cm.
Subjects:
Mine roof control.
Longwall mining.
Holdings details from CMU Storage Gov Pub Microfiche C502
Copy 1 CMU Storage Gov Pub Microfiche I 28.23:9220 Available

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