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Citations

Robert Blair on an improvement to Hadley's quadrant, 1785-07-30, GBR/0180/RGO 14/29: 27-31. Cambridge University Library.

Robert Blair on an improvement to Hadley's quadrant, 1785-07-30, GBR/0180/RGO 14/29: 27-31. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/109863 Accessed April 16, 2024.

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