Citations
Ordnance Survey information paper 4/1991. Ordnance Survey trig pillars - what will become of them?, 1991-03, GBR/3296/Maps/CCSA.OS_329_120, OS_329_120. Cambridge University Library. |
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Ordnance Survey information paper 4/1991. Ordnance Survey trig pillars - what will become of them?, 1991-03, GBR/3296/Maps/CCSA.OS_329_120, OS_329_120. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/244544 Accessed April 26, 2025. |