Online Books by
K. L. Heckman
Books from the extended shelves:
- Heckman, K. L.: Hydrogeology and subsurface nitrate in the Upper Big Blue Natural Resources District, Central Nebraska, July 1995 through September 1997 / (Lincoln, Neb. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : Branch of Information Services [distributor], 1998), also by I. M. Verstraeten, Virginia L. McGuire, and Upper Big Blue Natural Resources District (Neb.) (page images at HathiTrust)
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