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Henry Savage Sweetman: the man who uncovered Ireland’s medieval history
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Catalogue reference: OS 51/26
This record is about the Primary Triangulation Irish connection 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 Irish connection 1952: triangulation diagram from the Primary Triangulation of Great Britain observed 1952. Showing the Irish connection from the Mid and North Wales to South West Scotland and Ireland
OS 51
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Primary Triangulation Irish connection 1952: triangulation diagram from the Primary...
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