1. 'File 61/6 Vol. V. (D 39) Bin Saud, Nejd affairs' Date: 1921/1923 Language: English Geographic region: OjairMohammerahHail
2. File 2182/1913 Pt 2 'Persian Gulf Situation in El Katr Policy towards Bin Saud' Date: 1913/1916 Language: English Geographic region: El HassaOjair