The U.S. Geological Exploration of the Fortieth Parallel took place over five seasons, traveling through California, Nevada, Utah, and Colorado to map its topography, and discover its resources during ...

John McPhee’s five-book Annals of the Former World tracks the author’s geologic journey across the United States, at the fortieth parallel, on Interstate 80, using the highway’s exposed rock “roadcuts ...

To the massive and important series of volumes in which the Report of the Exploration of the Fortieth Parallel has been published the Engineer Department of the United States has just added a sixth ...

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