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Citations

Letter from [Friedrich Robert] Helmert to Sir George Howard Darwin; written at Potsdam, 1906-01-19, GBR/0012/MS DAR 251: 2059. Cambridge University Library.

Letter from [Friedrich Robert] Helmert to Sir George Howard Darwin; written at Potsdam, 1906-01-19, GBR/0012/MS DAR 251: 2059. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/795270 Accessed May 30, 2024.

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