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- Title
- Report of the Geological Exploration of the Fortieth Parallel, made by order of the Secretary of War according to acts of Congress of March 2, 1867, and March 3, 1869 / under the direction of A. A. Humphreys by Clarence King.
- Author
- United States. Geological Exploration of the Fortieth Parallel.
- Publication info
- Washington : Government Printing Office,
- 1870-1880.