1. Coll 30/135 'Bahrein: Production of oil - Royalty, Gauging, etc.' Date: 1936/1948 Language: English
5. Coll 30/232 'Arab Sheikhdoms of the Persian Gulf.' Creator: Author: Middle East (Official) CommitteeAuthor: Foreign Office Date: 1949/1949 Language: English
6. File 2249/1915 Pt 3 ‘OIL – PERSIA & MESOPOTAMIA; ANGLO-PERSIAN OIL COMPANY'S AFFAIRS; Royalties paid to Persian Govt’ Date: 1915/1920 Language: English