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On March 1, 1872 President Ulysses S. Grant signed into existence the world's first national park, Yellowstone National Park. The 2.2 million acres of wilderness is the only complete mid-latitude ecosystem left on the planet.
Grizzly Man
Parks and People: Dope
Big Bend: The Wild Frontier of Texas
Great natural monuments - Grand Canyon
National Parks Exploration Series: The Black Hills and The Badlands - Gateway to the West
Your Friend, Ranger Doug
Yosemite: America's Treasure
National Parks Exploration Series: Great Smoky Mountains
Rise of the Warrior Apes
For All People, For All Time
Smoky Mountain Park Rangers
Missing 411: The U.F.O. Connection
The Lake District: A Wild Year
Dartmouth, River Dart and Dartmoor
Rainforest First: Climate Protection in Central Africa
National Parks Exploration Series: Acadia - The First National Park East of the Mississippi
Yellowstone an American Legacy
Le Temps des vautours
