Classification of the Pennsylvanian rocks of Illinois as of 1956
By: by Harold R. Wanless.  Correlation chart compiled by Raymond Siever.
Contributors: Siever, Raymond.
Publisher: Illinois State Geological Survey
Published: 1956
Place of publication: Urbana
Language: eng
Number of pages: 14
Subjects: Rocks -- Classification and nomenclature.; Petrology -- Illinois.; Geology, Stratigraphic -- Pennsylvanian.
Notes: Bibliography: p. 13-14.
Cover title.