Ordnance Survey: Trigonometrical and Levelling Divisions: Liverpool Levelling Books and Abstracts
Surviving records from the original triangulation of Great Britain by the Ordnance Survey, these books contain descriptions and altitudes of bench marks levelled between 1865 and 1915.
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- OS Records of the Ordnance Survey of Great Britain
- Records of the Directorate of Field Survey and predecessors
- OS 17 Ordnance Survey: Trigonometrical and Levelling Divisions: Liverpool Levelling Books and...