Ground-water levels in the United States, 1967-71
Subtitle: North-Central States.
Series: U.S. Geological Survey water-supply paper -- 2090
Publisher: U.S. Government Printing Office
Published: 1973
Place of publication: Washington, DC
Language: eng
Number of pages: 114
Subjects: Water-supply -- United States.; Water -- Composition.
Notes: Prepared in cooperation with the States of Iowa, Kansas, Minnesota, Nebraska, North Dakota, South Dakota, and Wisconsin, and with other agencies.

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