TY  - BOOK
AU  - Grim,Ralph E.
TI  - Petrographic and ceramic properties of Pennsylvanian shales of Illinois,
AV  - QE471 .G74
PY  - 1941///
CY  - Urbana, Illinois
KW  - Shale
N1  - 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
ER  -