These maps were prepared by the Sudan Survey Office at Khartoum. There are two series - those compiled 1928-29 which Bagnold used during his 1932 expedition, and those compiled 1934-36 which include information provided by Bagnold's expeditions of 1930 and 1932.
Most of the maps have been annotated, originally in pencil but later in ink, with the route taken by the Bagnold expedition of 1932, with notes on topographical features and on the ease of travel by car. The detail provided by the maps is generally sparse, indeed some are virtually blank save for the information provided by Bagnold's team (see for example D.35). A number also have had the route of the 1930 expedition added neatly in ink prior to the 1932 expedition.