compiled by Bernard Bennett and drawn by Edwin Wong ; Presidio of San Francisco, California, Master Planning Office, Directorate of Facilities Engineer, Headquarters Presidio of San Francisco. Bar scale given in "feet". Includes location directory. Shows buildings, roads, trails, etc. "Since 1776 three flags have flown over the Presidio. Spain 1776-1822 -- Mexico: 1822-1846 -- United States: 1846 - to the present."