Petrographic and ceramic properties of Pennsylvanian shales of Illinois - Grim, Ralph E. (Ralph Early), 1902- (Urbana, Illinois, 1941)
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.
Keywords: Shale