Sheet I-37F Sunaisala GSGS 3919 Calcutta Edition 1941, reprinted 1941. Compiled and published originally SGI 1925. Revised Calcutta 1941 Feb. Published SGI. Edition date Feb 1941. Reproduced South African Survey Coy, June 1941. S.A.8. Reg.No.1820 D'25–1940. Grid B.