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By "Iowa Geological Survey. "
Devonian fishes of Iowa /
By: Eastman, Charles Rochester, - Iowa Geological Survey.
Publication info: Des Moines :Iowa Geological Survey,1908.
Contributed by: Smithsonian Libraries
Report on the Geological survey of the state of Iowa : embracing the results of investigations made during portions of the years 1855, 56 & 57 / by James Hall, J.D. Whitney.
By: Iowa Geological Survey. - Hall, James, - Whitney, J. D.
Publication info: Des Moines :Published by authority of the Legislature of Iowa,1858.
Contributed by: University of California Libraries (archive.org)