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
Sumatra Central Sheet GSGS Misc 110 First Edition 1944, printed 1945. GSGS (Misc.) No.110. Central Sumatra Geology after Zwierzycki (1919) simplified and revised. Inset: Reliability Diagram. Scale 1:5,000,000. Mapped 1:1,000,000 1919 and 1923, 1:500,000 1887 and 1925, 1:200,000 1921, 1823, 1924 and 1927, 1:100,000 1883. Compiled and drawn ISTD. Published WO 1944. Photolithographed WO 1944. 2,100/6/45 S.P.C.