United States of America, From the Mississippi River to the Pacific Ocean, near the 35th parallel of Latitude. Elm Creek. Fort Smith to the Rio Grande.
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Lieut. A. W. Whipple's exploration for a railway route, from the Mississippi River to the Pacific Ocean, near the 35th parallel of Latitude, in 1853-4. Collected by Dr. J. M. Bigelow, Surgeon and Botanist to the expedition