Books by Heron Lake Watershed District (Minn.):
Books in the extended shelves:
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Heron Lake Watershed District (Minn.): Appendix and Heron Lake model (U.S. Dept. of the Interior, U.S. Geological Survey ;, 2000), also by Perry M. Jones, Thomas A. Winterstein, Geological Survey (U.S.), and Minnesota. Department of Natural Resources (page images at HathiTrust)
Find more by Heron Lake Watershed District (Minn.) at your library, or elsewhere.