California Code, Public Resources Code - PRC § 6202

The commission may make surveys and subdivisions of lands belonging to the state to be sold, leased, or to have the boundary established, and the county recorder shall file maps thereof, made by the commission, without cost to the state.

Such maps shall be the official maps of the surveys and subdivisions, and all patents, leases, or boundary line agreements issued for the lands shall refer to the maps so filed. Such maps of state lands shall be legibly drawn, printed or reproduced by a process guaranteeing a permanent record in black on tracing cloth or polyester base film. If ink is used on a polyester base film, the ink surface shall be coated with a suitable substance to insure permanent legibility. The size of each sheet shall be 18 by 26 inches. A marginal line shall be drawn completely around each sheet, leaving an entire blank margin of one inch. The scale of the map shall be large enough to show all details clearly and enough sheets shall be used to accomplish this end. The particular number of the sheets and the total number of sheets comprising the map shall be stated on each of the sheets and its relationship to each adjoining sheet shall be clearly shown.