Publications of the Iowa Geological and Water Survey.
Submissions from 1930
Studies of Iowa Coals, Iowa Geological Survey
Submissions from 1929
Analyses of Iowa Coals, Iowa Geological Survey
Submissions from 1844
Report of a Geological Exploration of Part of Iowa, Wisconsin, and Illinois, made under Instructions from the Secretary of the Treasury of the United States in the Autumn of the Year 1839, with Charts and Illustrations, David Dale Owen, John Locke, and Ebenezer Phillips