Survey Of Practices In Controlling Roof At Intersections And Junctions In Underground Coal Mines


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Report of Investigations


Report of Investigations

Author:

language: en

Publisher:

Release Date: 1978


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Foam stimulation to enhance production from degasification wells in the Pittsburgh coalbed


Foam stimulation to enhance production from degasification wells in the Pittsburgh coalbed

Author: Peter F. Steidl

language: en

Publisher:

Release Date: 1978


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