13. Coll 30/140 'Visits of foreign warships to Persian Gulf Sheikhdoms.' Date: 1935/1948 Language: English Geographic region: Ras al Khaimah
14. Coll 5/6 ‘Muscat-Aden Air Route: Survey of Masirah Island’ Date: 1931/1938 Language: English Geographic region: ShuwamiyaSurMasirahRas al Khaimah