Handwritten and colored map of T1N R2E, T1N R3E, T1N R4E, T2N R2E, T2N R3E, T2N R4E, T3N R2E, T3N R3E, T3N R4E, in Contra Costa County, California. Includes the land north of the present-day locations of Oakley and Knightsen with landowner names and school districts.