Operations of Winding Gulf Collieries, to open 4000 acres of West Virginia No. 4 Pocahontas coal lying 345 ft below their worked-out Beckley seam; No. 4 is 38 to 44 in. thick; entry development plan; crew organization; rock work; slate disposal.
Economical entry driving with duckbills
Mechanization
Mechanization ; 12 , n 6
1948
Article (Journal)
English
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