1. ‘File 13/7 II Civil Aerodromes and Civil Air Agreement–Bahrain’ Date: 1935/1936 Language: English Geographic region: Sharjah
2. Coll 6/14 'Hejaz-Nejd: International Sanitary Arrangements.' Date: 1930/1932 Language: English Geographic region: Kingdom of Nejd and Hejaz
