01050cam a22002771  4500001001300000003000400013005001700017008004100034010001700075035001900092040003100111042001200142050002200154086001600176100004700192245012100239260004800360300005900408410005600467500005300523504003000576650004500606650004700651700003300698740004100731gs 63000240 DLC20260227111412.0761015s1963    dcuabd   b   f000 0 eng    ags 63000240   a(OCoLC)2505529  aDLCcOClUdISSdOCoLCdDLC  apremarc00aQE75b.P9 no. 3700 aI 19.16:3701 aRobinson, G. D.q(Gershon Du Vall),d1918-00aGeology of the Three Forks quadrangle, Montana.cWith sections on petrography of igneous rocks, by H. Frank Barnett.  aWashington,bU.S. Govt. Print. Off.,c1963.  a143 p.billus., maps (2 col.) diagrs., tables.c29 cm.20aGeological Survey (U.S.).tProfessional paper,v370  a4 pieces of illustrative matter fold. in pocket.  aBibliography: p. 135-140. 0aGeologyzMontanazThree Forks quadrangle 0aPetrologyzMontanazThree Forks quadrangle1 aBarnett, Henry Frank,d1921-4 aThe Three Forks quadrangle, Montana.