Citations
Photographic Zenith Tube (PZT), 1915, 1939-1984, GBR/0180/RGO 43/155-243. Cambridge University Library. |
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Photographic Zenith Tube (PZT), 1915, 1939-1984, GBR/0180/RGO 43/155-243. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/2038170 Accessed May 08, 2025. |