Soil Systems and Landscapes of the United States – Creating a National, Scalable Hierarchy of Soil Parent Material Terms for Teaching.
Philip J. Schoeneberger, USDA-NRCS, Lincoln, NE, Douglas A. Wysocki, 4631 S 50th Street, USDA-NRCS, Lincoln, NE, Sharon W. Waltman, NSSC-Geospatial Research Unit, USDA-NRCS, Morgantown, WV and Darrell G. Schulze, 915 Mitch Daniels Blvd, Purdue University, West Lafayette, IN, US