01028cam a22002531  4500001001300000003000400013005001700017008004100034010001700075035001900092040001900111050001600130100004200146245014300188260002900331300001800360410007100378500012400449500009900573504003200672650001100704740004200715999001700757gs 41000049 DLC20260227111346.0790608r1941uuuuilua     b   s000 0 eng    ags 41000049   a(OCoLC)5048401  aDLCcTxCMdDLC00aQE471b.G741 aGrim, Ralph E.q(Ralph Early),d1902-10aPetrographic and ceramic properties of Pennsylvanian shales of Illinois,cby Ralph E. Grim. Printed by authority of the state of Illinois.  aUrbana, Illinois,c1941.  a15 p.billus.20aIllinois State Geological SurveytReport of investigationsvno. 72  aAt head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey.  a"Reprinted from the Journal of the American Ceramic Society, vol. 24, no. 1, pp. 23-28, 1941."  aBibliographical foot-notes. 0aShale.0 aPre-Pennsylvanian shales of Illinois.  c27706d27706