Citations
Correspondence on the Photographic Zenith Tube (PZT), 1955 - 1963, GBR/0180/RGO 9/111. Cambridge University Library. |
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Correspondence on the Photographic Zenith Tube (PZT), 1955 - 1963, GBR/0180/RGO 9/111. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/99626 Accessed November 24, 2024. |