| BGS-1 Gazetteers and Handbooks, 1907-1940 | | Number of microfiches | 70 |  | | BGS-2 Oil exploration and oil concessions, 1912-1949 | | Number of microfiches | 269 |  | | BGS-3 Strategic interests in the Gulf, 1914-1951 | | Number of microfiches | 83 |  | | BGS-4 Trade and communications, 1926-1949 | | Number of microfiches | 124 |  | |
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