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Citations

'Royal Observatory, Greenwich, In the Magnetic Ground’, 1863, GBR/0180/RGO 116/5/9. Cambridge University Library.

'Royal Observatory, Greenwich, In the Magnetic Ground’, 1863, GBR/0180/RGO 116/5/9. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/146909 Accessed November 16, 2024.

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