Referenze: British War Offices 1:2,000,000 West Africa Series 1942-3; Gold Coast General Map 1:1,000,000, 1946; Sierra Leone Road Map 1:1,000,000 1946; Gambia Road Map 1:500,000 1946; Nigeria Office Map 1:1,000,000 1944; Military Series 1:500,000 1943; Minor corrections 1953 |