Colton, G.W. and C.B.:

$1,750 · Offered by William Reese Company

COLTON'S CALIFORNIA AND NEVADA. A very detailed West Coast pocket map, with routes of the Central Pacific Railroad snaking through the state of California and part of Nevada, with additional rail lines for the Nevada Central Railroad in that state. California is densely packed with the names of towns, cities, and mines, numerous topographical notations, and the counties of both states are differentiated by color. A later issue of Colton's 1873 California and Nevada map, but also larger and more detailed than that issue, representing the explosion of new settlement in the American West in the 1880s.

Found via Rare Books Intel, a search across rare-book dealers, auction houses and marketplaces worldwide.