Sheet 27 Sebha GSGS 4231 First Edition 1941. Copied from map by 512 (A Fd Svy) Coy RE 1941. Original Italian map 1:400,000 dated 1932-34. GSGS 4231. Published WO 1941. Heliographed OS 1941. 1547/12/41.L.R. Libyan Grid; South Libyan Grid. Extruded to south-west for Múrzuch.
Sheet 29 Bu Hasciscia GSGS 4231 First Edition 1941. Copied from map by South African Survey Coy SAEC 1941. Copied from DR 71 Reproduction of Italian map dated 1934; revision dated July 1941 from map supplied by G(Des.). GSGS 4231. Published WO 1941. Heliographed OS 1941. 1547/12/41.L.R. Libyan Grid; South Libyan Grid. Extruded to south-west for Múrzuch.
Sheet 31 Calànscio (Kalansho) Sand Sea GSGS 4231 First Edition 1942. Copied from map by South African Survey Coy SAEC 1941. Reproduced from 1:500,000 compilation of LRDG material dated October 1941. GSGS 4231. Published WO 1942. Heliographed OS 1942. 1036/3/42 L.R. Libyan Grid; South Libyan Grid; Egyptian "Purple" Grid.
Sheet 32 Big Cairn GSGS 4231 First Edition 1942. Copied from map by South African Survey Coy SAEC 1941. Reproduced from 1:500,000 compilation of LRDG material, and surveys P A Clayton. GSGS 4231. Published WO 1942. Heliographed OS 1942. 1036/3/42, L.R. Egyptian "Purple" Grid.
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.