49. File 10/5 I Saudi Arabia: Hasa Oil Concession; visit of Major Holmes to Saudi Arabia; Kuwait blockade. Date: 1932/1935 Language: English Geographic region: Al-HasaKuwait
50. File 10/5 II Hasa oil: CASOC's activities in Hasa; development of Ras Tannura; Political Agent's visit to Hasa Date: 1935/1941 Language: English Geographic region: Al-Hasa
51. File 1508/1905 Pt 3 'Bahrain: postal arrangements; mails; post office' Date: 1905/1912 Language: English Geographic region: BasraAl-Hasa
52. File 2182/1913 Pt 11 'Arabia: relations with BIN SAUD Hedjaz-Nejd Dispute' Date: 1919/1920 Language: English Geographic region: KhurmaTarabahHasa
53. File 2182/1913 Pt 1 'Persian Gulf Situation in El Katr Policy towards Bin Saud' Date: 1913/1913 Language: English Geographic region: El HassaNejd
54. File 2182/1913 Pt 2 'Persian Gulf Situation in El Katr Policy towards Bin Saud' Date: 1913/1916 Language: English Geographic region: El HassaOjair
55. File 2877/1914 'Persian Gulf and Mesopotamia: survey operations of RIMS Palinurus' Date: 1911/1916 Language: English Geographic region: KuwaitHasaIraq
56. File 1855/1904 Pt 8 'Koweit:- Arabia Chiefs' attitude towards tribes of the interior (Nejd etc.)' Date: 1904/1908 Language: English Geographic region: Pirate CoastHassaNejd