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Catalogue reference: OS 51/157
This record is about the Traverse optical survey - use of horizontal staff behind detail: photograph circa... 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 behind detail: photograph circa 1950 of use of tachyometer
OS 51
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Traverse optical survey - use of horizontal staff behind detail: photograph circa...
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