National Geologic Map Database
General Information
- Title: Use of isotopes to identify sources of ground water, estimate ground-water flow rates, and assess aquifer vulnerability in the Calument region of northwestern Indiana and northeastern Illinois
- Author(s): Kay, R.T., Bayless, E.R., and Solak, R.A.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Water-Resources Investigations Report 2002-4213
- Publication Date: 2002
- Map Scale: 1:161,000
- Cross Section: None
- North Latitude: 41° 44' 50" N (41.7472)
- South Latitude: 41° 33' 32" N (41.5589)
- East Longitude: 87° 5' 0" W (-87.0833)
- West Longitude: 87° 44' 0" W (-87.7333)
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