From surveys by the Hai Ho Conservatory Commision between 1905 and 1930 ; Depths on the bar, inside the 12 ft. curve, are from the 1921 Report of the Commission; from Deep Hole to Quarantine Sta., they are from Chinese Admiralty chart of 1931. Depths shown by soundings and isolines. 1935 variation compasses. Shows approach depths, drainage, various objects/facilities, roads. Notes on tidal currents, depths, docks. Descriptive text, such as "Flat muddy foreshore sprinkled with shells." No. 1870.