00829cam a22002651  4500001001300000003000400013005001700017008004100034010001700075035001900092040003700111042001200148050001700160082001100177100002200188245003700210260001900247300004000266490007700306504002500383650003300408650002400441810008100465999001700546gs 57000181 DLC20260227111405.0830122s1956    mtu           000 0 eng c  ags 57000181   a(OCoLC)9155891  aU.S. Geol. Survey Libr.cOUdDLC  apremarc00aTN275b.S814  a622.331 aStout, Koehler S.10aOperating ideas for small mines.  a[Butte]c1956.  avii, 81 p.billus., diagrs.c19 cm.1 aMontana. Bureau of Mines and Geology. Miscellaneous contributionvno. 14  aBibliography: p. 81. 0aMineral industrieszMontana. 0aMining engineering.2 aMontana Bureau of Mines and Geology.tMiscellaneous contributions ;vno. 14.  c29156d29156