Physical Results of Research Drilling in Thermal Areas of Yellowstone National Park, Wyoming. Geological Survey professional Paper 892
Washington: United States Government Printing Office, 1975. softcover, 11.5" x 9", 70 pages, indexed, illustrated, creased rear top cover2.25 penciled on front cover. very good. Item #5568292
from the abstract, "The Shallow parts of geothermal systems are important for the understanding of total systems, but commercial geothermal drilling has focused almost entirely on target depths of 2,000 ft. and more." dx4.
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