Examines one of North America's natural wonders from helicopter, speedboat, at high-tech labs and from rope's end.
Janson Media, 88 Semmens Rd., Harrington Park, NJ 07640, Phone: (201)784-8488, Fax: (201)784-3993, URL: http://www.janson.com, Remarks: Betsy Van Ost, Dir.
Available on VHS
Running time 54 minutes.
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