• Darwin Archive | 'Expression of emotions': photographs and portfolio I | 'Expression of emotions': portfolio I | [of 'Expression'] [copy for Figs 5-10, including prints of woodcuts of dogs and cats] [with instructions for engraver], 1871-01-01 - 1882-04-30 | [of 'Expression'] [copy for Figs 9-10], 1871-01-01 - 1882-04-30

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