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To F. T. Köppen 28 April [1871]
Summary
Thanks for FTK’s locust paper ["Die geographische Verbreitung der Wanderheuschrecke", Petermann’s Geogr. Mittheil. (1871)].
Author: | Charles Robert Darwin |
Addressee: | Friedrich Theodor Köppen (Fedor Petrovich Keppen) |
Date: | 28 Apr [1871] |
Classmark: | Archive of the Russian Academy of Sciences, St Petersburg branch: SPBB ARAS (Fond 92. Register 1. Folder 112. P. 1, 1 r) |
Letter no: | DCP-LETT-7723 |
To F. T. Köppen 18 November 1874
Summary
Thanks FTK for telling him of Jahn’s work [see 9719], of which CD had not heard. It would have been of greatest use in writing Descent.
Author: | Charles Robert Darwin |
Addressee: | Friedrich Theodor Köppen (Fedor Petrovich Keppen) |
Date: | 18 Nov 1874 |
Classmark: | Archive of the Russian Academy of Sciences, St Petersburg branch: SPBB ARAS (Fond 92. Register 1. Folder 112. P. 3, 3 r) |
Letter no: | DCP-LETT-9722 |
Addressee
Köppen, F. T. | (2) |