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Ordnance Survey celebrates 80 years of the trig pillars that helped map Great Britain. ... most often known as a "trig pillar" or "trig point" and a welcome ... in the Peak District, affords trig ...
Ordnance Survey celebrates 80 years of the trig pillars that helped map Great Britain. ... most often known as a "trig pillar" or "trig point" and a welcome ... in the Peak District, affords trig ...
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