IOR/X/14483

From the surveys and reconnaissances of Hermann von Wissmann, made during the van der Meulen-von Wissmann expeditions of 1931 and 1939, and combined with the results of other expeditions. Aden Protectorate. Scale 1:500,000. Royal Geographical Society.

Combined with the surveys of von Wissmann are details from the maps of O H Little 1925, H StJ B Philby 1936, F Heybroek 1950 and others. Also incorporated are part of GSGS 3997, the Iraq Petroleum Company's map from air photographs, the air reconnaissance map of S/Ldr Bellerby 1947, and some detail supplied from air photographs by DOS. Compilation sources [diagram on sheet 2]: Air survey; GSGS 3997; Iraq Petroleum Company map; Bellerby air reconnaissance 1947; planetable survey Little 1925, Heybroek 1930; detailed route mapping von Wissmann 1931 & 1929, Philby 1936; linear route mapping Bent, Bunker, Bury, de Sturler Raemaekers, Helfritz, Hirsch, H & D Ingrams, Lake, Miles & Munzinger, Rickards, Stark, Thesiger and von Wrede.