00781cam a22002411  4500001001300000003000400013005001700017008004100034010001700075035001900092040002500111042001200136050001600148100004800164245003400212260004400246300007000290490005400360504002800414650002200442810005800464999001700522gs 62000273 DLC20260227111411.0740920s1962    xx            000 0 eng    ags 62000273   a(OCoLC)1017665  aDLCcNRUdOCoLCdDLC  apremarc00aQE133b.P461 aPerry, Eugene S.q(Eugene Sheridan),d1892-10aMontana in the geologic past.  aButte,bMontana School of Mines,c1962.  avi, 78 p.billus., port., maps (1 fold.) diagrs., tables.c28 cm.1 aMontana. Bureau of Mines and Geology. Bulletin 26  aBibliography: p. 77-78. 0aGeologyzMontana.2 aMontana Bureau of Mines and Geology.tBulletin ;v26.  c29649d29649