Maldive Islands To Sumatera (Sumatra). Indian Ocean. International Chart Series INT 707. Admiralty Chart 4707. 18 January 1974. Scale 1:3,500,000. Small Corrections to 11 February 1976 [printed] and 1976 1690 [hand-stamped violet]. Printed August 1976.
[North-eastern part.] Title and references. Inset: Pakistan And Surrounding Countries. [Scale approximately 1:90,000,000.] Inset: Agricultural Map West Pakistan [And] East Pakistan. Scale 1 inch = 200 miles or 1:12,672,000.
Sumatra Northern Sheet ISTD Edition 1944. Northern Sumatra Geology after Zwierzycki (1919) simplified with amendments in Bireuen & Toba Lake areas & south of Langsaa. Compiled & drawn ISTD. February 1944. I.S.T.D./F/367