Sheet I21,L1 Negombo Ceylon Edition reprinted Military Series sheet 61 Dehra Dun 1942. Published SGC. Surveyed 1905; Revised 1939. SDC Reprinted 16.5.41. Reprinted with addition of grid Dehra Dun 1942 (May). Heliozincographed SIO Dehra Dun. Reg.No.66 X.D.D.42–6,200. Gridded.