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       Author Hague, Arnold Full Title Crandall Sheet. Geology Sheet VIII. Monograph XXXII. Yellowstone National Park. U.S. Geological Survey. Charles D. Walcott, Director. 1904. Julius Bien & Co. Lith. N.Y. A. H. Thompson, Geographer. Triangulation and Topography by Frank Tweedy. Surveyed in 1893. Geology by Arnold Hague, Geologist in charge, Assisted by Joseph P. Iddings and Thomas A. Jaggar Jr., Surveyed in 1893 and 1897. Publisher United States Geological Survey Author Hague, Arnold Full Title Ishawooa Sheet. Geology Sheet XV. Monograph XXXII. Yellowstone National Park. U.S. Geological Survey. Charles D. Walcott, Director. 1904. Julius Bien & Co. Lith. N.Y. A. H. Thompson, Geographer. Triangulation and Topography by Frank Tweedy. Surveyed in 1893. Geology by Arnold Hague, Geologist in charge, Assisted by Thomas A. Jaggar Jr., Surveyed in 1893 and 1897. Publisher United States Geological Survey 
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