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Many of the photographs used in these articles are also in the Samuel Calvin Photographs collection.

Current Issue: Volume 38, Issue 1 (1941)

Front Matter

Articles

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The Illinoian and Post-Illinoian Pleistocene Geology of Iowa p. 1-262
George F. Kay and Jack B. Graham

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Ceramic Shales and Clays of Iowa p. 263-378
Charles S. Gwynne

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Cambrian Strata of Northeastern Iowa p. 379-422
Walter C. Schuldt

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Mineral Production in Iowa in 1939 and 1940 p. 423-456
H. Garland Hershey