17. 'File 10/21 (10/1 B) Bahrain Oil Concession: Proposal by the Bahrain Petroleum Company Limited to install radio telephones' Date: 1933/1942 Language: English
21. 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