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Haeckel, Ernst in correspondent 
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From:
Charles Robert Darwin
To:
Ernst Philipp August (Ernst) Haeckel
Date:
21 Jan 1880
Source of text:
Ernst-Haeckel-Haus (Bestand A-Abt. 1:1-52/50 [A 9904])
Summary:

Thanks EH for copy of book [Das System der Medusen (1879)].

Contributor:
Darwin Correspondence Project