Front Matter
Articles
Forty-ninth and Fiftieth Annual Reports of the State Geologist p. vii-xii
Arthur C. Trowbridge
The Illinoian and Post-Illinoian Pleistocene Geology of Iowa p. 1-262
George F. Kay and Jack B. Graham
Ceramic Shales and Clays of Iowa p. 263-378
Charles S. Gwynne
Cambrian Strata of Northeastern Iowa p. 379-422
Walter C. Schuldt
Mineral Production in Iowa in 1939 and 1940 p. 423-456
H. Garland Hershey