Publication Information: Key Details: Catalog B030 Publication Year 1917 Author Illinois State Geological Survey Publication Type Bulletins Additional Details: Publication Link Bulletin 30 Plate 1 (1 MB pdf) Map showing progress of topographic surveys Plate 2 (4 MB pdf) Economic and structure map of the Colchester and Macomb Qua… Plate 3 (4 MB pdf) Map of Canton Quadrangle showing the slope of the Illinois … Publication Price Out of print