Explorations and surveys for a railroad route from the Mississippi River to the Pacific Ocean, War Department : routes in Oregon and California : profiles sheet no. 2, from the head of Des Chutes Valley to Vancouver and from Vancouver to Fort Reading : from explorations and surveys made under the direction of Hon. Jefferson Davis, sec. of war and by order of Lieut R.S. Williamson, U.S. Topl. Engrs.

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