Descriptions and mileages for over 100 trails, including 45-day hikes

Suggested hiking list, divided into short, medium and long distances

Detailed trip-planning information: equipment needs, backcountry use permits, camping techniques, and more

Full section on hiking safely in grizzly bear territory

34 topographic maps, 3D views of major peaks, and trail elevation profiles

Mark & Joy Marschall have lived and worked in Yellowstone as park rangers.  Mark was a ranger for over 20 years, spending much of that time doing backcountry patrol.  Joy was a ranger-naturalist, leading guided hikes in the Fishing Bridge area.  They have combined their firsthand knowledge of the park with that of other rangers to produce an accurate and up-to-date guide to Yellowstone's trails.