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1860-1869::1868::09::23 in date 
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From:
Charles Robert Darwin
To:
Alfred Russel Wallace
Date:
23 Sept [1868]
Source of text:
The British Library (Add MS 46434: 153–6)
Summary:

On their differences concerning sexual selection and protection.

Contributor:
Darwin Correspondence Project
Text Online
From:
Charles Robert Darwin
To:
Alfred Russel Wallace
Date:
23 September [1868]
Source of text:
  • British Library, The: BL Add. 46434 ff. 153-156
  • Marchant, J. (Ed.). (1916). In: Alfred Russel Wallace; Letters and Reminiscences. Vol. 1. London & New York: Cassell & Co. [pp. 225-227]
Summary:

No summary available.

Contributor:
Alfred Russel Wallace Correspondence Project