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  1. 1
    Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa /
    by Agnew, Allen F., 1918-2012
    Published 1956
    Subjects: “...Geology Iowa....”
    Government Document Book
  2. 2
    Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa /
    by Agnew, Allen F., 1918-2012
    Published 1956
    Subjects: “...Geology Iowa. http://id.loc.gov/authorities/subjects/sh2008117930...”
    Get full text
    Government Document eBook
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