ordnance survey trig pillar
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ordnance survey trig pillar |
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| Ordnance Survey triangulation point or pillar on the summit of Cyrn y Brain North Wales. Built in the 1930s and used for mapping and survey work these mark summits of hills and mountains and serve as navigation aids to hikers |
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Stockphotos.ro (c) 2024. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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