Description of data files compiled for the Central Midwest Regional Aquifer-System Analysis / by John O. Helgesen and Cristi V. Hansen.

Bibliographic Details
Main Author:	Helgesen, John O.
Corporate Author:	Geological Survey (U.S.)
Other Authors:	Hansen, Cristi V.
Language:	English
Published:	Denver, Colo. : Department of the Interior, U.S. Geological Survey : Books and Open-File Reports [distributor], 1989.
Series:	U.S. Geological Survey open-file report ; 89-42.
Subjects:	Groundwater > Middle West. Hydrology > Middle West. Aquifers > Middle West.
Physical Description:	1 microfiche : negative, illustrations, maps.
Format:	Government Document Microfilm Book

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