Visitor rating
Depicts the work of glaciers in forming the Great Lakes thousands of years ago and illustrates topographical changes now occurring.
Encyclopedia Britannica, 331 N. LaSalle St., Chicago, IL 60610, Phone: (312)347-7159, Toll-free: 800-323-1229, Fax: (312)294-2104, URL: http://www.britannica.com
Available on VHS
Running time 11 minutes.
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