Your Friend, Ranger Doug

National Parks Exploration Series: Yellowstone

National Parks Exploration Series: The Black Hills and The Badlands - Gateway to the West

Big Bend: The Wild Frontier of Texas

National Parks Exploration Series: The Everglades

Missing 411: The U.F.O. Connection

Yellowstone: The Mystery of the Wolves

Rise of the Warrior Apes

Grizzly Man

Yosemite: America's Treasure

Great natural monuments - Grand Canyon

National Parks Exploration Series: Acadia - The First National Park East of the Mississippi