Citations
'New levelling instruments', 1951, GBR/3296/Maps/CCSA.IM_497_9, IM_497_9. Cambridge University Library. |
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'New levelling instruments', 1951, GBR/3296/Maps/CCSA.IM_497_9, IM_497_9. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/239972 Accessed November 15, 2024. |