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1Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa /by Agnew, Allen F., 1918-2012Subjects: “...Geology, Stratigraphic Ordovician....”
Published 1956
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2by Shaffer, Paul R. (Paul Raymond), 1910-Subjects: “...Geology, Stratigraphic Illinois....”
Published 1954
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5Subjects: “...Geology Iowa. http://id.loc.gov/authorities/subjects/sh2008117930...”
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6Subjects: “...Geology Iowa. http://id.loc.gov/authorities/subjects/sh2008117930...”
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8Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa /by Agnew, Allen F., 1918-2012Subjects: “...Geology Illinois. http://id.loc.gov/authorities/subjects/sh2008117928...”
Published 1956
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9Published 1907Subjects: “...Geological mapping Illinois....”
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10Published 1907Subjects: “...Geological mapping Illinois....”
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11Published 1932Subjects: “...Geology United States. http://id.loc.gov/authorities/subjects/sh85054080...”
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