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Citations

Letter from Thomas Hedgcock regarding a method of finding longitude, 1815-06-01, GBR/0180/RGO 14/11: 223-225. Cambridge University Library.
Letter from Thomas Hedgcock regarding a method of finding longitude, 1815-06-01, GBR/0180/RGO 14/11: 223-225. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/109516 Accessed March 25, 2023.