Illinois State Geological Survey Report No 13 Stratigraphy Geologic Plates 1927
Stratigraphy and Geologic Struction of Northern Illinois from 1927 Author: FT THWaites Title: Illinois State Geological Survey Report of Investigations No. 13, Stratigraphy and Geologic Structure of Northern Illinois with Special Reference to Underground Water Supply, 1927 Publication: Urbana: University of Illinois, 1927 Description: Paperback. First edition, 1927. The cover is separated from the book, 50 pp, illustrated including maps.
Included maps * Plate I - Structure map of Northern, IL * Plate II