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Catalogue reference: OS 51/155
This record is about the Traverse optical survey - use of horizontal staff off setting: photograph circa 1950... dating from 1950 Jan 01-1968 Dec 31 in the series Ordnance Survey: Photographs and Pictorial Images. It is held at The National Archives, Kew.
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Traverse optical survey - use of horizontal staff off setting: photograph circa 1950 of the use of a tachyometer and horizontal staff to off set from the corner of a building
OS 51
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Traverse optical survey - use of horizontal staff off setting: photograph circa 1950...
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