General Information Regarding Yellowstone National Park:
Season of 1918
Written by the National Park Service, United States
Published by the Government Printing Office, Washington, 1918
This 82-page booklet can give you an interesting perspective about Yellowstone - the way it was a century ago compared with what it is today. And you'll be able to better appreciate the wonders in the park's almost 3,500 square miles full of lakes, canyons, rivers and mountain ranges in the states of Wyoming, Montana, and Idaho.
(Have a safe trip!)