Citations
Correspondence on photographic zenith tubes, 1943 - 1954, GBR/0180/RGO 9/110. Cambridge University Library. |
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Correspondence on photographic zenith tubes, 1943 - 1954, GBR/0180/RGO 9/110. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/99625 Accessed April 18, 2024. |