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Citations

Correspondence on the Photographic Zenith Tube and Meridian Group, 1950 - 1953, GBR/0180/RGO 9/219. Cambridge University Library.

Correspondence on the Photographic Zenith Tube and Meridian Group, 1950 - 1953, GBR/0180/RGO 9/219. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/99734 Accessed February 25, 2024.

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