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Ravenser Odd
Series
Catalogue reference: OS 17
OS 17
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.
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.
Records of the Ordnance Survey of Great Britain
Ordnance Survey: Trigonometrical and Levelling Divisions: Liverpool Levelling Books and Abstracts
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