Title Work Title No: 15641 Medium: Moving Image Date: 1951 (Release) Original Summary: "Through animated drawings and live-action photography depicts the work of glaciers in forming the Great Lakes thousands of years ago. Defines present-day drainage of the Lakes and the physical characteristics of Niagara Falls. Illustrates topographical changes which occur in the region around the Falls and the Lakes." - Summary from Worldcat. Countries of Origin: U.S.A. Genres: Educational
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