Report of the Geological Exploration of the Fortieth Parallel Volume v. 4; pt.3

This is Volume 4, Part 3, of the "Report of the Geological Exploration of the Fortieth Parallel," documenting a comprehensive survey of the geology, natural resources, and topography along the 40th parallel in the western United States in the late 19th century. Compiled under the direction of Julius Bien, the report offers detailed observations, maps, and analyses of the region's geological formations, mineral deposits, and physical geography. A valuable historical resource for understanding the geological landscape of the American West and the scientific endeavors of the time.

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