Sheet 39 Tazerbo GSGS 4231 First Edition 1942. Copied from map by South African Survey Coy SAEC 1941. Reproduced from 1:400,000 compilation of LRDG material dated Oct 1941. GSGS 4231. Published WO 1942. Heliographed OS 1942. 1000/3/42. L.R. South Libyan Grid.