nols.edu - In the Summer of 1969, Michael Wadleigh, Charles Grosbeck and Fred Underhill filmed an entire 30-day NOLS wilderness expedition in Wyoming's Wind River Range. The film Thirty Days to Survival, featuring NOLS founder Paul Petzoldt and other early instructors, aired nationally on the Alcoa Hour, on January 20, 1970. Due largely to the film's success and visibility, NOLS' enrollment more than doubled in the summer of 1970 and tripled again in 1971.

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