Interactive Levelling and Trig Map

Interactive Levelling and Trig Map

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1GL 2GL( Pro) 3GL

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Nearby Secondry Blocks:
NC20 NH54 NG80 NG24

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Ordnance Survey's
Levelling
of Great Britain

[1GL, 2GL Abstract]
[1GL, 2GL Transcription]

[Timeline]
[FBM List]

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