GSGS (Series) ; 3868. 3rd ed. "Compiled by the Geographical Section, General Staff, 1929. Field revision by R.E. Survey Section 1935-37. Drawn and heliographed at the Ordnance Survey 1929, 1939. Photolithographed by O.S. 1945." World polyconic projection.
Donated by Mr. Glory Ling (Hong Kong), October 2015.
