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- WO - Records created or inherited by the War Office, Armed Forces, Judge Advocate General, and related bodies
- Division within WO - Records of the Chief of the (Imperial) General Staff and its directorates
- WO 401 - War Office and Ministry of Defence: Survey Services: Directorate of Military Survey and Survey Units: Map and Chart Catalogues
- Subseries within WO 401 - GEOGRAPHIC SECTION, GENERAL STAFF (GSGS)