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From:
Charles Robert Darwin
To:
Christian Gottfried Ehrenberg
Date:
22 July [1866?]
Source of text:
Archiv der Berlin-Brandenburgischen Akademie der Wissenschaften (Nachlass Ehrenberg, Nr. 321)
Summary:

Thanks CGE for two papers and for his assistance of many years ago.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Christian Gottfried Ehrenberg
Date:
18 Nov [1869]
Source of text:
Archiv der Berlin-Brandenburgischen Akademie der Wissenschaften (Nachlass Ehrenberg, Nr. 321, Brief von Charles Darwin)
Summary:

Thanks CGE for memoir on the Bacillariae of Mexico [Abh. K. Akad. Wiss. Berlin (Phys.) (1869): 1–66].

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Christian Gottfried Ehrenberg
Date:
30 Dec 1873
Source of text:
Archiv der Berlin-Brandenburgischen Akademie der Wissenschaften (Nachlass Ehrenburg, Nr. 321)
Summary:

Thanks CGE for gift of his latest work [Mikrogeologische Studien (1873)].

Contributor:
Darwin Correspondence Project