REPORT ON LESSER KNOWN THERMAL FEATURES OF YELLOWSTONE NATIONAL PARK, PART 1 1981-1985 by Marie Wolf and Rocco Paperiello. This work contains thorough descriptions, excellent drawings depicting many features, and maps of very accessible but seldom visited thermal areas, many of which are near Park roads or in major geyser basins. Pages 1 - 706 contain Mammoth Hot Springs and the Firehole River Geyser Basins (Lone Star, Upper, Midway, Lower). 723 pages including foreword and index. Double-sided unbound photocopy.