Petrology of the Pennsylvania underclays of Illinois
By: by Ralph E. Grim and Victor T. Allen.
Contributors: Allen, Victor T. 1898- joint author.
Series: Illinois.  State geological survey.  Report of investigations; no. 52
Publisher: Printed by authority of the state of Illinois
Published: 1938
Place of publication: Urbana, Ill
Language: eng
Number of pages: 1514
Subjects: Petrology -- Illinois.; Clay -- Illinois.
Other titles: Pennsylvanian underclays of Illinois.
Notes: "Works to which reference is made": p. 1500-1510.
cover title.
At head of title: State of Illinois ... Department of registration and education ... Division of the State geological survey ...
Reprinted from the Bulletin, Geological Society of America, vol. 49, 1938.