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Citations

Thomas Johnstone's instrument for finding longitude by an observation of the Sun, 1806, GBR/0180/RGO 14/38: 242-252. Cambridge University Library.

Thomas Johnstone's instrument for finding longitude by an observation of the Sun, 1806, GBR/0180/RGO 14/38: 242-252. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/110103 Accessed June 25, 2024.

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