Petrographic and ceramic properties of Pennsylvanian shales of Illinois,
Grim, Ralph E. 1902-
Petrographic and ceramic properties of Pennsylvanian shales of Illinois, by Ralph E. Grim. Printed by authority of the state of Illinois. - Urbana, Illinois, 1941. - 15 p. illus.
At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey. "Reprinted from the Journal of the American Ceramic Society, vol. 24, no. 1, pp. 23-28, 1941."
Bibliographical foot-notes.
gs 41000049
Shale.
QE471 / .G74
Petrographic and ceramic properties of Pennsylvanian shales of Illinois, by Ralph E. Grim. Printed by authority of the state of Illinois. - Urbana, Illinois, 1941. - 15 p. illus.
At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey. "Reprinted from the Journal of the American Ceramic Society, vol. 24, no. 1, pp. 23-28, 1941."
Bibliographical foot-notes.
gs 41000049
Shale.
QE471 / .G74