Ishawooa Sheet.

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.

Hague, Arnold

1904

1904

United States Geological Survey

1:125 000

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