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  1. 1
    Exploratory drilling program of the U. S. Geological Survey for evidences of zinc-lead mineralization in Iowa and Wisconsin, 1950-51 /
    Subjects: “...Zinc ores Iowa....”
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    Government Document eBook
  2. 2
    Exploratory drilling for evidence of zinc and lead ore in Dubuque County, Iowa /
    Subjects: “...Zinc ores Iowa Dubuque County....”
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    Government Document eBook
  3. 3
    Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa /
    by Agnew, Allen F., 1918-2012
    Published 1956
    Subjects: “...Zinc ores. http://id.loc.gov/authorities/subjects/sh85149867...”
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    Government Document eBook
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