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Citations

Ralph Walker's azimuth compass, 1793 - 1795, GBR/0180/RGO 14/29: 99-126. Cambridge University Library.

Ralph Walker's azimuth compass, 1793 - 1795, GBR/0180/RGO 14/29: 99-126. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/109868 Accessed May 20, 2024.

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