Citations
Future policy for Ordnance Survey levelling services, 1973-04, GBR/3296/Maps/CCSA.IM_397_27, IM_397_27. Cambridge University Library. |
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Future policy for Ordnance Survey levelling services, 1973-04, GBR/3296/Maps/CCSA.IM_397_27, IM_397_27. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/239061 Accessed May 15, 2025. |