01247cam a22002891 4500 gs 39000002 DLC 20260227111343.0 780901s1938 iluab b s000 0 eng gs 39000002 (OCoLC)4185446 DLC UU OCoLC DLC QE105 .A25 no. 52 Grim, Ralph E. (Ralph Early), 1902- Petrology of the Pennsylvania underclays of Illinois, by Ralph E. Grim and Victor T. Allen. Urbana, Ill., Printed by authority of the state of Illinois, 1938. 1485-1514p. illus(map)2pl. on ll.,tables(part fold.) 25cm. Illinois. State geological survey. Report of investigations no. 52 cover title. At head of title: State of Illinois ... Department of registration and education ... Division of the State geological survey ... Reprinted from the Bulletin, Geological Society of America, vol. 49, 1938. "Works to which reference is made": p. 1500-1510. Petrology Illinois. Clay Illinois. Allen, Victor T. (Victor Thomas), 1898- joint author. Pennsylvanian underclays of Illinois. 27501 27501