Geological map of south west Hadhramut, eastern Aden Protectorate (Directorate of Overseas Surveys, 1963)
Mit 1 Nebenkt.: Eastern Aden Protectorate index map. - "This map is one of three accompanying "The Stratigraphy and Structure of the Eastern Aden Protectorate" by Z. R. Beydoun, published in Supplement No. 5 of "Overseas Geology and Resources"