Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Pacific Railroad Surveys (1853-1855) explored possible routes for a transcontinental railroad across North America. Substantial collection of natural history material was made during the surveys as well. The results were published in the 12-volume Reports of Explorations and Surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean, published by the United States War Department from 1855 to 1860. The surveys contained significant material on natural history, including many illustrations of reptiles, amphibians, birds, and mammals. Some of these illustrations were hand-colored.
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