• Darwin Archive | 'Descent of man': portfolios | 'Descent of man' second edition, 1874 | 'Descent of man' second edition: scraps relating to 'Moral sense', mammals and birds, 1867 - 1874 | Moral Sense-105 Letter, 1871-04-06 | David Wedderburn to Charles Robert Darwin [envelope], 1871-04-06

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