Citations
John Churchman on magnetic variation and finding the longitude, 1787 - 1804, GBR/0180/RGO 14/42: 56-141. Cambridge University Library. |
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John Churchman on magnetic variation and finding the longitude, 1787 - 1804, GBR/0180/RGO 14/42: 56-141. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/110196 Accessed September 16, 2024. |