The Yellowstone Story traces the history of the Yellowstone region from the time when hunters and gatherers migrated into the Rocky Mountains thousands of years ago to the post-World War II era when tourists began inundating Yellowstone National Park. Volume I takes the account from prehistoric times through the mid-1880s, with emphasis on the park's exploration and its trouble-filled early years under federal management. Volume II covers the years of military administration of the park and the more recent developments under the National Park Service.