Uxi ERS iTY OF I llinois, September 1. 1916. State Geological Survey, Governor E. F. Dunne, Cliairman, and Members of t Jie Geological Commission, Gentlemen :I submit herewith a report on the Geography of the upper Illinois Valley and History of Development, by Carl Ortwin Sauer, and recommend that it be published as Bulletin No. 27. The tield work was done in 1910 under the general supervision of Professor R. D.S alisbury, consulting geologist. At the time the work was done I r. Sauer was anTT mljer of the Department of Geology of the University of Chicago. He is now Professor of Geography at the University of Michigan. The present report is one of a series of educational bulletins which have proved very popular A vith the public. The science of geography has advanced rapidly within the past few years, and the interest of teachers and laymen is proved by the demand for educational bulletins published by the Survey. The present bulletin will be of interest primarily to residents of the region, but it contains a wealth of geographic material which will be useful to anyone interested in nature study. Very respectfully, Frank W. De Wolf, Director.
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