Mike Graf
Yosemite National Park: Harrowing Ascent of Half Dome
Yellowstone National Park: Eye of the Grizzly (Adventures with the Parkers)
My Yosemite: A Guide for Young Adventurers
Bryce Canyon and Zion National Parks: Danger in the Narrows
Grand Canyon National Park: Tail of the Scorpion
Olympic National Park: Touch of the Tide Pool, Crack of the Glacier
Grand Teton National Park: To the Top of the Grand
Arches and Canyonlands National Parks: In the Land of Standing Rocks (Adventures with the Parkers)
Glacier National Park: Going to the Sun (Adventures with the Parkers)
Great Smoky Mountains National Park: Ridge Runner Rescue (Adventures with the Parkers)
How Does a Cloud Become a Thunderstorm? (How Does It Happen?)
Rocky Mountain National Park: Peril on Longs Peak (Adventures with the Parkers Book 8)
Africa (Continents)
Great Smoky Mountains National Park
How Does a Cloud Become a Thunderstorm?