01521cam a22003011 4500 gs 41000011 DLC 20260227111346.0 780909s1940 ilua b s000 0 eng gs 41000011 (OCoLC)4209290 DLC UU OCoLC DLC TN941 .G77 QE105 .A25 no. 69 Copy 2. 552/.52 Grim, Ralph E. (Ralph Early), 1902- (1) Elements of the petrographic study of bonding clays and of the clay substance of molding sands [by] Ralph E. Grim. (2) Mineral composition and texture of clay substance of natural molding sands [by] Ralph E. Grim and Carl E. Schubert. (3) The relationship between the physical and mineralogical characteristics of bonding clays [by] Ralph E. Grim and Richards A. Rowland ... Printed by authority of the state of Illinois. Urbana, Ill., 1940. 32 p. incl. illus., tables, diagrs. 25 cm. Illinois. State geological survey. Report of investigations no. 69 At head of title: State of Illinois ... Department of registration and education ... Division of the State geological survey ... "Reprinted from the Transactions of the American foundrymen's association, vol. 47, no. 4, pp. 895-908, 935-953; vol. 48, no. 1, pp. 211-224, 1940." Bibliography: p.32. Clay. Sand. Schubert, Carl Edward, 1899- Rowland, Richards A. 27686 27686