1980 (1959) USGS Walnut Creek Quad 7.5 min topo

Measures 22 x 27" covering Walnut Creek , Pleasant Hill, Concord, Lafayette , Alameda County. 7.5 minute map from the archive of an engineering firm , de-accessioned . Fine condition on this combination map with 1959 content updated to 1980 with purple lithographic overlay. SHows considerable growth in this region during that period w/ 70% in updated purple