Citations
Letter from Johann Wilhelm Spengel to Charles Robert Darwin; written at Berlin, 1871-05-10, GBR/0012/MS DAR 177: 235. Cambridge University Library. |
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Letter from Johann Wilhelm Spengel to Charles Robert Darwin; written at Berlin, 1871-05-10, GBR/0012/MS DAR 177: 235. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/766084 Accessed May 16, 2024. |