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Citations

Sunspot drawings of H.S. Schwabe, 1869 - 1880, GBR/0180/RGO 58. Cambridge University Library.

Sunspot drawings of H.S. Schwabe, 1869 - 1880, GBR/0180/RGO 58. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/97366 Accessed April 24, 2024.

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