Quest in Yosemite National Park
The elements of Marie Curie : how the glow of radium lit a path for women in science
Cowpuppy : an unexpected friendship and a scientist's journey into the secret world of cows
Hard truths : think and lead like a Green Beret
Call us what we carry : poems
Sarah's flag For Texas
National park mystery series : three books in one
I who have never known men
Danger in Zion National Park
The music box
Gone to Texas : a history of the Lone Star State
Lone star nation : how a ragged army of volunteers won the battle for Texas independence and changed America