D. P. Franzmeier, G. C. Steinhardt, and R. B. Bryant. Loess Distribution in Wabash County, Indiana and Characteristics of Late Wisconsin Tills in Northeastern Indiana.
G. C. Steinhardt and D. P. Franzmeier. Composition of the Clay Mineralogy of the Argillic and Fragipan Horizons of Soils of the Cincinnati Catena.
Thomas G. VanHorn and William W. McFee. Acid Rainfall Sensitive Soils of the Eastern United States.