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Darwin, C. R. in correspondent 
Thorell, T. T. T. in correspondent 
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From:
Charles Robert Darwin
To:
Tord Tamerlau Teodor Thorell
Date:
20 Apr 1870
Source of text:
Sotheby’s, New York (dealers) (1997)
Summary:

Thanks TTTT for his study of European spiders [On European spiders Part 1 (1869–70)] which bases its classification system on the theory of evolution.

Contributor:
Darwin Correspondence Project