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- Deadly waters, a mystery in Everglades National Park, Gloria Skurzynski and Alane Ferguson
- Wolf stalker, a mystery in Yellowstone National Park
- Cliff-hanger, a mystery in Mesa Verde National Park, Gloria Skurzynski and Alane Ferguson ; [maps by Carl Mehler]
- Ghost horses, a mystery in Zion National Park, Gloria Skurzynski and Alane Ferguson
- Ghost horses, a mystery in Zion National Park, Gloria Skurzynski and Alane Ferguson
- Deadly waters, a mystery in Everglades National Park, Gloria Skurzynski and Alane Ferguson
- The hunted, a mystery in Glacier National Park
- Running scared, a mystery in Carlsbad Caverns National Park, Gloria Skurzynski and Alane Ferguson
- Over the edge, a mystery in Grand Canyon National Park, Gloria Skurzynski, Alane Ferguson
- Out of the deep, a mystery in Acadia National Park, Gloria Skurzynski and Alane Ferguson
- Skurzynski, Gloria, Mysteries in our national parks, #7
- Deadly waters, a mystery in Everglades National Park, Gloria Skurzynski and Alane Ferguson
- Buried alive, a mystery in Denali National Park, Gloria Skurzynski and alane Ferguson
- Out of the deep, a mystery in Acadia National Park, Gloria Skurzynski and Alane Ferguson
- Skurzynski, Gloria, Mysteries in our national parks, #2
- Buried alive, a mystery in Denali National Park, Gloria Skurzynski and alane Ferguson
- Night of the black bear, a mystery in Great Smoky Mountains National Park
- Over the edge, a mystery in Grand Canyon National Park
- Wolf stalker, a mystery in Yellowstone National Park
- Night of the black bear, a mystery in Great Smoky Mountains National Park
- Cliff-hanger, a mystery in Mesa Verde National Park, Gloria Skurzynski and Alane Ferguson ; [maps by Carl Mehler]
- Skurzynski, Gloria, Mysteries in our national parks
- Running scared, a mystery in Carlsbad Caverns National Park, Gloria Skurzynski and Alane Ferguson
- Valley of death, a mystery in Death Valley National Park
- Valley of death, a mystery in Death Valley National Park
- The hunted, a mystery in Glacier National Park