92. 'File No: 10/1 (Vol: I). Oils & Minerals. Bahrain Oil Concession' Date: 1932/1933 Language: English
93. 'File 14/1 II Oil concession in Muscat' Date: 1937/1937 Language: English Geographic region: Oman
94. 'File 14/1 Vol 7 OIL CONCESSIONS MUSCAT [DHOFAR - BURAIMI - HUQF]' Date: 1949/1949 Language: English Geographic region: Al ḨuqfHuqfOmanDhofar