Ordnance Survey: Directorate of Field Survey: Branch Files
This series contains Ordnance Survey branch files. They relate to all aspects of field survey work, including triangulation and levelling, the Retriangulation of Great Britain, resurvey, overhaul and revision, and air survey.
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- OS Records of the Ordnance Survey of Great Britain
- Records of the Directorate of Field Survey and predecessors
- OS 13 Ordnance Survey: Directorate of Field Survey: Branch Files