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(1926) Annual Report Of the State Geologist, 1925-1926, Vol. 32. Natural Resources, Department of
(1926) Sketch of the Geology of Iowa, 1926. University of Iowa
(1926) Thirteenth Report of the Iowa Library Commission Made to the Governor of Iowa for the Biennial Period July 1, 1924 to June 30, 1926. Library of Iowa, State