The following books are interesting, informative, and easy to find: Yellowstone, A Visitor's Companion, by George Wuerthner, Stackpole Books, Harrisburg, Pennsylvania; The Yellowstone Story (2 volumes), by Aubrey Haines, Colorado Associated University Press; Searching for Yellowstone, by Paul Schullery, Mariner Books, New York; Yellowstone Trails: A Hiking Guide, by Mark C. Marschall, Yellowstone Association, Yellowstone National Park; Death in Yellowstone, by Lee Whittlesey, Roberts Rinehart Publishers, Boulder, Colorado; Grand Teton National Park, available from the Grand Teton Natural History Association; A Guide to Exploring Grand Teton National Park, by Linda L. Olson and Tim Bywater, RNM Press, Salt Lake City, Utah; Crucible for Conservation, by Robert Righter, Grand Teton Natural History Association, Moose, Wyoming; and Teton Trails: A Guide to the Trails of Grand Teton National Park, by Katy Duffy and Darwin Wile, Grand Teton Natural History Association. Falcon Press (Helena, Montana) also publishes a long list of hiking, fishing, climbing, and other guides to the Yellowstone/Grand Teton region.
If you cannot find these publications in your local bookstore, many can be ordered from either the Yellowstone Association (tel. 307/344-2293; www.yellowstoneassociation.org) or the Grand Teton Natural History Association (tel. 307/739-3606; www.grandtetonpark.org).