Yellowstone is at the center of this well-illustrated, superbly informed guide, which also includes the spectacular volcanoes of Hawaii, the Southwest Pacific Northwest and Alaska. A geophysicist at Dartmouth and former scientist-at-charge of the Hawaiian Volcano Observatory, Robert Decker writes winningly of the formation, diversity and allure of volcanoes in an introductory section. With 255 color photographs and 28 outstanding maps.  (USW514, $24.95)