One of the rarest of all gold rush era maps. The map extends form Monterey and the centeral San Joaquin Valley to the Prairie Butes, well north of Sacramento, providing one of the earliest detailed topographical accounts of the SF Bay and Gold Regions of California. Along Wilkes primary trail from San Francisco to north of Sacramento are many annotations regarding the natural resources and topography. Several early mines are noted, as are other areas simply labeled Gold. The map is also interesting for its treatment of SF Bay and vicinity, including soundings, topographical detail, Indian Villages, raods, missions, pueblos, etc. The map was issued in Wilkes now rare Western America, including California and Oregon… The map represents the latest information at the dawn of the gold rush. Streeter referred to the Wilkes book as essentially the first guidebook to the Pacific Coast. Wheat observes that Wilkes' maps, though early 1849 in type, and requiring to be read in the light of what has been quoted, are enlightening now as then. The map is rarely well preserved and all examples we have noted on the market in recent years were restored. This example is backed with japan paper, with occasional minor loss at the fold interesections, with repaired fold splits and tears. Still, a presentable copy of this rarity. Wheat 646, Wheat Gold Region 134, Wagner-Camp 175a:1, Streeter 3326.