15. Coll 20/5 'Muscat: Sur: Misbehaviour of Beni Bu Ali tribe; Aiqa customs post; Question of Air Action' Date: 1931/1938 Language: English Geographic region: Sur
16. Coll 5/6 ‘Muscat-Aden Air Route: Survey of Masirah Island’ Date: 1931/1938 Language: English Geographic region: ShuwamiyaSurMasirahRas al Khaimah
17. ‘File 2/22 II. AVIATION. B. ROYAL AIR FORCE. (3L) R.A.F. Landing Ground at Sur.’ Date: 1934/1935 Language: English Geographic region: Sur
18. File 4640/1928 Pt 2 ‘Muscat Situation at Sur.’ Date: 1926/1931 Language: English Geographic region: SurAiqaSultanate of Muscat and Oman
19. File 4640/1928 Pt 4 ‘MUSCAT: FUTURE POLICY IN. Tariffs.’ Date: 1928/1932 Language: English Geographic region: United States of AmericaSultanate of Muscat and OmanFranceSur