Context

Context of Map no. 2 from the northern boundary of California to the Columbia River, from explorations and surveys made under the direction of Hon. Jefferson Davis, Sec. of War by Lieut. R.S. Williamson, U.S. Topl. Engrs. and Lieut. H.L. Abbot, U.S. Topl. Engrs. ; H.C. Fillebrown, J. Young, and C.D. Anderson, assts. ; drawn by John Young ; engd. by Selmar Siebert, (cartographic material)
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