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 ...

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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THE Titanotheres are a group of odd-toed hoofed mammals which lived during the early part of the Tertiary epoch about the fortieth parallel of latitude in North America and Asia, and occasionally ...