Tracer gas as an aid in mine ventilation analysis

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100 1 ‡aThimons, Edward D.
245 1 0 ‡aTracer gas as an aid in mine ventilation analysis / ‡cby E.D. Thimons and F.N. Kissell.
260 ‡a[Washington, D.C.] : ‡bU.S. Bureau of Mines, ‡c[1974]
300 ‡a17 p. : ‡billus., tables ; ‡c26 cm.
490 0 ‡aReport of investigations / United States. Bureau of Mines ; ‡v7917
504 ‡aIncludes bibliographical references (p. 17).
538 ‡aMode of access: Internet.
650 0 ‡aMine ventilation.
700 1 ‡aKissell, Fred N.
710 2 ‡aPittsburgh Mining and Safety Research Center.
710 1 ‡aUnited States. ‡bBureau of Mines.
776 1 ‡aThimons, Edward D. ‡tTracer gas as an aid in mine ventilation analysis ‡h17 p. ‡w(OCoLC)236167347
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