Statistics for occurrence #1 of “Mississippi River” in chapter 4 of Philip Henry Sheridan, Personal Memoirs of P. H. Sheridan, General, United States Army .:

...opes of the Cascade chain. The survey was being made in accordance with an act of Congress, which provided both for ascertaining the most practicable and economical route for a railroad between the Mississippi River and the Pacific Ocean, and for military and geographical surveys west of the Mississippi River. Fort Reading was the starting-point for this exploring expedition, and there I arrived some four ...
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