This interesting map is based on Fremont's map. The region west of the Mississippi to the Pacific Ocean is delineated with the rivers and towns of the gold region in California well depicted. The expedition route described is that of Captain Benjamin Bonneville who explored the American West from 1832-1836. The expedition party traveled parallel to the course of the Snake and the Columbia Rivers, going as far as Fort Walla Walla before turning back. Fremont's route through California is shown, as well as Kearny's route along the Gila River and the Emigrant route.

References: Wagner-Camp #67:14, cf. Wheat (TMW) #424.

Condition: B

Issued folding, now flat, with light toning. Short fold separations at left and a 5" binding tear at right have been repaired on verso with archival materials. The binding trim at bottom right, the left margin, and a small chip at top left have been replaced with old paper, with small sections of the neatline replaced in facsimile.