Title: Out of the Deep: A Mystery in Acadia National Park, Author: Gloria Skurzynski
Title: Cliff-Hanger: A Mystery in Mesa Verde National Park, Author: Gloria Skurzynski
Title: The Hunted: A Mystery in Glacier National Park, Author: Gloria Skurzynski
Title: Valley of Death: A Mystery in Death Valley National Park, Author: Gloria Skurzynski
Title: Wolf Stalker: A Mystery in Yellowstone National Park, Author: Gloria Skurzynski
Title: Night of the Black Bear: A Mystery in Great Smoky Mountains National Park, Author: Gloria Skurzynski
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Title: Ghost Horses: A Mystery in Zion National Park, Author: Gloria Skurzynski
Title: Escape from Fear: A Mystery in Virgin Islands National Park, Author: Gloria Skurzynski
Title: Running Scared: A Mystery in Carlsbad Caverns National Park, Author: Gloria Skurzynski
Title: Buried Alive: A Mystery in Denali National Park, Author: Gloria Skurzynski
Title: Over the Edge: A Mystery in Grand Canyon National Park, Author: Gloria Skurzynski
Title: Deadly Waters: A Mystery in Everglades National Park, Author: Gloria Skurzynski