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Description
Professor J. S. Diller of the U. S. Geological Survey first visited the Mount Lassen region in 1883 and continuted studies of this area for the next 40 years. Upper view of Big Boiler at elevation of 7,075 feet. 1/2 mile N. E. of Broke-Off MTN and about a mile N. W. of ____________[?] works. June 23, 1921. J. D. Tempt. must be about 200 degrees F. rather more than less.
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