01038cam a22002771 4500 gs 40000340 DLC 20260227111346.0 780909s1940 ilua b s000 0 eng gs 40000340 (OCoLC)4209288 DLC UU OCoLC DLC premarc TN948.F6 M3 Machin, James Stewart, 1893- Effect of fluorspar on silicate melts with special reference to mineral wool, by J.S. Machin and J.F. Vanecek. Urbana, Ill., 1940. 15p. incl.tables,diagrs. 25cm. Illinois. State geological survey. Report of investigations no. 68 At head of title: State of Illinois ... Department of registration and education ... Division of the State geological survey ... Printed by authority of the state of Illinois. Bibliography: p. 15. Fluorspar. Mineral wool. Vaneck, James Franklin, 1915- joint author. 27675 27675