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From:
Charles Robert Darwin
To:
Friedrich Theodor Köppen (Fedor Petrovich Keppen)
Date:
28 Apr [1871]
Source of text:
Archive of the Russian Academy of Sciences, St Petersburg branch: SPBB ARAS (Fond 92. Register 1. Folder 112. P. 1, 1 r)
Summary:

Thanks for FTK’s locust paper ["Die geographische Verbreitung der Wanderheuschrecke", Petermann’s Geogr. Mittheil. (1871)].

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Friedrich Theodor Köppen (Fedor Petrovich Keppen)
Date:
18 Nov 1874
Source of text:
Archive of the Russian Academy of Sciences, St Petersburg branch: SPBB ARAS (Fond 92. Register 1. Folder 112. P. 3, 3 r)
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.

Contributor:
Darwin Correspondence Project