Official Map of Sonoma County, California Compiled From The Official Maps In The County Assessor's Office, With Additions And Corrections To June 1st 1900 by L.E. Ricksecker, City Engineer Of Santa Rosa, Ex-County Surveyor, and W.B. Walkup, Publisher. Approved and declared to be the official map of Sonoma County, by resolution of the Board of Supervisors, September 7th 1900 ... Copyrighted Sept. 1900 By W.B. Walkup. (one sheet of four only, upper right sheet with title showing the northwestern portions of the county).
