This is the late 1863 - early 1864 edition in this series of maps. Arizona still commands the Southern tip of Nevada and has the county configurations of the old New Mexico Territory, with the addition of Castle Dome and Ewell counties in the south. The Utah/Nevada border is now at 115°. This is a completely new plate with much changed in watershed and mountain detail and several of the earlier notations removed. Details the U.S. Mail routes, the Emigrant roads to California, the proposed railroad route through Utah, Nevada and California, and the Pony Express trail.

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Condition: B+

The map has light overall toning and a little scattered foxing. Two short centerfold separations have been repaired with archival tape on verso.