2. 'File XXIII/1 Travels in Oman, Travels in Oman, 1901-1908' Date: 1901/1908 Language: English Geographic region: OmanDhufar
3. 'File 11/33 Boundary of Dhofar and limits of political jurisdiction of Muscat and Aden' Date: 1937/1947 Language: English Geographic region: Kuria Muria IslandsDhufarAden Protectorate
4. PZ 2855/1932 'Southern Arabia: Enquiry from Mr F.B. Lacy regarding possible presence of mineral deposits.' Date: 1932/1933 Language: English Geographic region: Dhufar