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Exploratory drilling for evidence of zinc and lead ore in Dubuque County, Iowa


Flint, Arthur E., 1913- author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1956. 1956

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Location Call No. OPAC Message Status
 Axe Federal Documents Online  I 19.3:1027-K    ---  Available
2
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Zinc-lead-copper resources and general geology of the upper Mississippi Valley district


Heyl, Allen V. (Allen Van), 1918-2008, author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1955. 1955

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Location Call No. OPAC Message Status
 Axe Federal Documents Online  I 19.3:1015-G    ---  Available
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