USGS · hu23
Hydrologic Unit Map -- 1974, Minnesota
Abstract
This map and accompanying table show Hydrologic Units that are basically hydrographic in nature. The Cataloging Units shown will supplant the Cataloging Units previously used by the U.S. Geological Survey in its Catalog of Information on Water Data (1966-72).
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Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey. 1974. Hydrologic Unit Map -- 1974, Minnesota. https://doi.org/10.3133/hu23
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