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Publisher
- Illinois State Geological Survey2
- LPS Natural Resource District1
- ML InfoMap (Firm)6
- Michigan Center for Geographic Information1
- Minnesota Department of Natural Resources, Division of Waters4
- Minnesota Geological Survey17
- Newman Library (Bernard M. Baruch College)1
- Not given3
- Oak Ridge National Laboratory1
- Ohio. Division of Geological Survey1
- Purdue University Libraries1
- United Arab Emirates Government2
- United States Geological Survey2