A how-to-guide to safety in the park -- and an oddly absorbing chronicle of what can go terribly wrong, including death by drowning, hypothermia, animal attacks, fire and car crash. It's a reminder to visitors that Yellowstone is a wilderness, not an amusement park. Tim Cahill (Lost in My Own Backyard) suggests, not entirely in jest, that the book ought to be required reading for anyone entering the park.  (USW276, $16.95)