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Citations

First day cover from the British Astronomical Association with Halley’s Comet 17p stamp affixed, 1986-02-18, GBR/0180/RGO 97/5/1. Cambridge University Library.

First day cover from the British Astronomical Association with Halley’s Comet 17p stamp affixed, 1986-02-18, GBR/0180/RGO 97/5/1. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/146790 Accessed December 22, 2024.

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