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- HO - Records created or inherited by the Home Office, Ministry of Home Security, and related bodies
- Division within HO - Air Raid Precautions Department, Ministry of Home Security, Civil Defence and Common Services Department and Emergency Planning Department
- HO 198 - Ministry of Home Security: Research and Experiments Department, Bomb Census Papers
- Subseries within HO 198 - FORMS BC2 AND BC4 - PILOTED AIRCRAFT