Title: Rock stratigraphy of the Silurian system in northeastern and northwestern Illinois
First published: 1973
Subjects: Geology, Geology, Stratigraphic, Stratigraphic Geology, Gesteenten, Nomenclatuur
Places: Illinois
Time periods: Silurian
LC classification: QE105 .A45 no. 479, QE661 .A45 no. 479