PBS - The National Parks: America's Best Idea (HD) (2009) Part 5 “Great Nature” (1933–1945)

THE NATIONAL PARKS, a film by Ken Burns, is the story of an idea as uniquely American as the Declaration of Independence: that the most special places in the nation should be preserved for everyone. The series traces the birth of the national park idea in the mid-1800s and follows its evolution for nearly 150 years, chronicling the addition of new parks through the stories of the people who helped create them.

Part 5: “Great Nature” (1933–1945)

Emphasizes the societal impacts of the park concept, including new environmental and naturalistic perspectives, employment opportunities and application of the park idea to additional geographical locations.

The National Parks (Wikipedia).

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