2000. Thompson, Todd A.(Todd Alan), 1959-cartographer. Includes ill., text, graphs showing Lake-level fluctuations over the past 4,700 years and a timeline showing historical events since 1166 B.C. tied... Indiana University, Indiana Geological Survey.
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1997. Ault, Curtis H. Relief shown by contours.; Coordinates printed at top and lower margin are incorrect.; Includes index map, text, and sectionized township diagram. ... Indiana University, Indiana Geological Survey.