Citations
Correspondence of the Royal Greenwich Observatory concerning the role of the Photographic Zenith Tube (PZT) in gathering data for the Jet Propulsion Laboratory project, California, USA, 1971 - 1973, GBR/0180/RGO 43/193, Box 20: RGO 43/187-200: Series GBR/0180/RGO 43. Cambridge University Library. |
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Correspondence of the Royal Greenwich Observatory concerning the role of the Photographic Zenith Tube (PZT) in gathering data for the Jet Propulsion Laboratory project, California, USA, 1971 - 1973, GBR/0180/RGO 43/193, Box 20: RGO 43/187-200: Series GBR/0180/RGO 43. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/2038326 Accessed May 19, 2025. |