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1by Pammel, L. H (Louis Hermann), 1862-1931, Pammel, L. H (Louis Hermann), 1862-1931, Pammel, L. H (Louis Hermann), 1862-1931“...Iowa Geological Survey,...”
Published 1913
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14by Horick, Paul J“...Iowa Geological Survey,...”
Published 1984
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15by Tilton, John Littlefield, 1863“...Iowa Geological Survey,...”
Published 1896
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16by Bain, Harry Foster, 1872-1948“...Iowa Geological Survey,...”
Published 1897
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17by Bain, Harry Foster, 1872-1948“...Iowa Geological Survey,...”
Published 1896
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18Published 1925“...Iowa Geological Survey,...”
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