Context

Context of Map no. 1 from San Francisco Bay to the northern boundary of California, 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, (cartographic material)
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