The Platteville and Galena groups in northern Illinois
By: H. B. Willman, Dennis R. Kolata.
Contributors: Kolata, Dennis R., joint author.
Series: Illinois State Geological Survey circular ; 502; Circular (Illinois State Geological Survey) ;; 502.
Publisher: Illinois State Geological Survey
Published: 1978
Place of publication: Urbana
Language: eng
Number of pages: 75
Subjects: Geology, Stratigraphic -- Ordovician.; Geology -- Illinois.
Notes: Bibliography: p. 73-75.