Roof and rib fall accident and cost statistics : an in-depth study

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100 1 ‡aPappas, Deno M.
245 1 0 ‡aRoof and rib fall accident and cost statistics : ‡ban in-depth study / ‡cby Deno M. Pappas.
260 ‡a[Pittsburgh, Pa.] : ‡bU.S. Dept. of the Interior, Bureau of Mines, ‡c[1987]
300 ‡aii, 20 p. ; ‡c28 cm.
336 ‡atext ‡btxt ‡2rdacontent
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490 0 ‡aInformation circular / Bureau of Mines ; ‡v9151
504 ‡aBibliography: p. 19-20.
538 ‡aMode of access: Internet.
650 0 ‡aMine accidents. ‡0http://id.loc.gov/authorities/subjects/sh85085495
650 0 ‡aMine roof control. ‡0http://id.loc.gov/authorities/subjects/sh85085531
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