Cutter roof failure : six case studies in the Northern Appalachian Coal Basin /

I tiakina i:
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Kaituhi matua: Bauer, Eric R.
Hōputu: Tē mōhiotia
Reo:Ingarihi
I whakaputaina: [Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, [1990]
Rangatū:Information circular (United States. Bureau of Mines) ; 9266.
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