Useful information for visiting Yellowstone National Park

The best source of information about the Park; opening hours, entrance fees, the Ranger program, maps etc is the Park Service website. The Park map shows the main attractions and has notes as to their difficulty and buggy / wheelchair accessibility.

http://www.nps.gov/yell/index.htm

If you want more detailed information, a good guidebook that covers the Park and surrounding district is the Moon Handbook “Yellowstone and Grand Teton” by Don Pitcher, published by Avalon Travel. Lonely Planet also publishes a comprehensive guidebook covering the same area.