37. Coll 30/123(3) 'Bahrein (Unallotted Zone) Oil Concession: Negotiations with the Bahrain Petroleum Company.' Date: 1939/1947 Language: English
38. Coll 30/121 'Bahrain Oil Concession: Reservation by the Bahrain Petroleum Company of land not within the original reservation.' Date: 1935/1937 Language: English