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Catalogue reference: OS 51/23
This record is about the Primary Triangulation Figure 7 1951-1952: triangulation diagram from the Primary... 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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Primary Triangulation Figure 7 1951-1952: triangulation diagram from the Primary Triangulation of Great Britain observed 1951-1952. Figure 7 taken from the group of observations covering North Wales, the Isle of Man and South West Scotland described in Appendix 10 of 'History of the Retriangulation of Great Britain 1935-1962'
OS 51
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Primary Triangulation Figure 7 1951-1952: triangulation diagram from the Primary...
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