8 x 10" map of the presidio army base in San Francisco in 1870 . A lithograph documenting the oldest military base on the pacific founded in 1776 by Alta Mira and abandoned by Mariano Vallejo when removing 50 troops to Sonoma ' El Quartel to protect the Contra Costa del Norte, Sonoma County. Legend has complete building allocation and functions listed. fine condition, exceedingly rare.