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Mysteries in Our National Parks: Cliff-Hanger: A Mystery in Mesa Verde National Park
Mysteries in Our National Parks: Night of the Black Bear: A Mystery in Great Smoky Mountains National Park
Mysteries in Our National Parks: Out of the Deep: A Mystery in Acadia National Park
Mysteries in Our National Parks: Over The Edge: A Mystery in Grand Canyon National Park
Mysteries in Our National Parks: The Hunted: A Mystery in Glacier National Park
Mysteries in Our National Parks: Valley of Death: A Mystery in Death Valley National Park
This Is Rocket Science: True Stories of the Risk-taking Scientists who Figure Out Ways to Explore Beyond
Mysteries in Our National Parks: Buried Alive: A Mystery in Denali National Park
Mysteries in Our National Parks: Deadly Waters: A Mystery in Everglades National Park
Mysteries In Our National Parks: Ghost Horses: A Mystery in Zion National Park
Mysteries in Our National Parks: Wolf Stalker: A Mystery in Yellowstone National Park
Mysteries in Our National Parks: Escape From Fear: A Mystery in Virgin Islands National Park
Mysteries in Our National Parks: Running Scared: A Mystery in Carlsbad Caverns National Park