Lonely Planet Yellowstone & Grand Teton National Parks (Travel Guide)
Yellowstone: Battle for Life (SD)
Lonely Planet Grand Canyon National Park (Travel Guide)
Over The Edge: Death in Grand Canyon, Newly Expanded 10th Anniversary Edition
National Geographic Guide to National Parks of the United States, 7th Edition (National Geographic Guide to the National Parks of the United States)
The National Parks: America's Best Idea
Fodor's The Complete Guide to the National Parks of the West (Full-color Travel Guide)
America's National Parks - The Complete Collection
National Geographic Complete National Parks of the United States: 400+ Parks, Monuments, Battlefields, Historic Sites, Scenic Trails, Recreation Areas, and Seashores