You searched for: Creator Ault, Curtis H. Remove constraint Creator: Ault, Curtis H. Time Period 1950-1999 Remove constraint Time Period: 1950-1999

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Locations of clay and shale operations in Indiana Maps maps Indiana University indiana-university

1968. Webb, William M. and Ault, Curtis H. Includes generalized columnar section, 'Sectionized township,' and index of producers of clay and clay products. 'Base modified from U.S. Geologica... Indiana Geological Survey.