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- ADM - Records of the Admiralty, Naval Forces, Royal Marines, Coastguard, and related bodies
- Division within ADM - Records of Naval Staff Departments
- ADM 223 - Admiralty: Naval Intelligence Division and Operational Intelligence Centre: Intelligence Reports and Papers
- Subseries within ADM 223 - OPERATIONAL INTELLIGENCE CENTRE
- Subsubseries within ADM 223 - Special Intelligence Summaries