Citations
John Macdonald on the position of the magnetic pole and finding longitude by magnetic variation, 1830-04-04, GBR/0180/RGO 14/43: 549-567. Cambridge University Library. |
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John Macdonald on the position of the magnetic pole and finding longitude by magnetic variation, 1830-04-04, GBR/0180/RGO 14/43: 549-567. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/110242 Accessed February 19, 2025. |