• Darwin Archive | 'Insectivorous plants': portfolios, 1860 - 1876 | Experimental treatments and observations, 1872 - 1873 | proof sheets of 'Expression' pp 25, 33, 17, 1871-01-01 - 1882-04-01 | proof sheet of 'Expression' p 17, 1871-01-01 - 1882-04-01

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