1917. 2018-05-15T17:54:45Z. 2018-05-15T17:54:45Z. Illinois State Geological Survey. State of Illinois, Dept. of Registration and Education, State Geological Survey Division. English. cartographic image. Public. Illinois and Illinois.
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2. Topographic map of Hardin County and adjoining part of Pope County, Illinois [cartographic material]
1930. 2018-05-14T19:33:55Z. 2018-09-05T19:40:47Z. Illinois State Geological Survey. U.S. Geological Survey. English. cartographic image. Public. Hardin County (Ill.), Illinois, and Hardin County.
