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  1. 1
    Extension of Tazewell glacial substage of western Illinois and eastern Iowa /
    Book
  2. 2
    Relations of the Wisconsin and Kansan drift sheets in central Iowa, and related phenomena ...
    by Bain, Harry Foster, 1872-1948
    Published 1897
    Thesis Book
  3. 3
    Hydrologic data for a study of pre-Illinoian glacial till in Linn County, Iowa, water year 1990 /
    by Bowman, Phillip R.
    Published 1991
    Government Document Microform Book
  4. 4
    Hydrologic data for a study of pre-Illinoian glacial till in Linn County, Iowa, water year 1991 /
    by Bowman, Phillip R.
    Published 1992
    Government Document Microform Book
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