Strategies for encouraging miners to stay away from unsupported roof and perform self-protective actions /

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Kaituhi matua: Peters, Robert H.
Hōputu: Tē mōhiotia
Reo:Ingarihi
I whakaputaina: Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines, 990.
Rangatū:Information circular (United States. Bureau of Mines) ; 9283.
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