01247cam a22002891  4500001001300000003000400013005001700017008004100034010001700075035001900092040002400111050002300135100004200158245009700200260007300297300006500370490007400435500001700509500013300526500007900659504005400738650002500792650002000817700006100837740004200898999001700940gs 39000002 DLC20260227111343.0780901s1938    iluab    b   s000 0 eng    ags 39000002   a(OCoLC)4185446  aDLCcUUdOCoLCdDLC00aQE105b.A25 no. 521 aGrim, Ralph E.q(Ralph Early),d1902-10aPetrology of the Pennsylvania underclays of Illinois,cby Ralph E. Grim and Victor T. Allen.  aUrbana, Ill.,bPrinted by authority of the state of Illinois,c1938.  a1485-1514p.billus(map)2pl. on ll.,tables(part fold.)c25cm.0 aIllinois.  State geological survey.  Report of investigationsvno. 52  acover title.  aAt head of title: State of Illinois ... Department of registration and education ... Division of the State geological survey ...  aReprinted from the Bulletin, Geological Society of America, vol. 49, 1938.  a"Works to which reference is made": p. 1500-1510. 0aPetrologyzIllinois. 0aClayzIllinois.1 aAllen, Victor T.q(Victor Thomas),d1898-ejoint author.0 aPennsylvanian underclays of Illinois.  c27501d27501