Mushrooms Demystified by David Arora (Berkeley: Ten Speed Press), 1986
At nearly 1,000 pages this is for the serious mushroom hunter.
All That the Rain Promises and More . . . by David Arora (Berkeley: Ten Speed Press), 1991
This pocket guide describes some 200 of the most common Western mushrooms. You will still need more than just a book to identify much beyond the distinctive chanterelle.