The Iowan drift; a review of the evidences of the Iowan stage of glaciation; a co-operative study for the U.S. Geological survey and the Iowa Geological survey
Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb. M.M. Leighton's thesis (Ph. D.)--University of Chicago, 1916 "Private edition, distributed by the University of Chicago libraries, Chicago, Illinois." "Reprinted from Iowa Geological survey, volume XXVI, Annual report for 1915."
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