| BIY-1 Yemen: Gazetteers and handbooks, 1877-1917 | | Number of microfiches | 28 |  | | BIY-2 Political and Secret Subject Files on Yemen and the Aden Protectorate, 1902-1930 | | Number of microfiches | 169 | | | BIY-3 Political and Secret Collections on Yemen and the Red Sea, c. 1930-1945 | | Number of microfiches | 40 | | | BIY-4 Political and Secret Collections on the Aden Protectorate, c. 1930-1948 | | Number of microfiches | 51 | |
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