• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Geotropism. Extant subfolders: 'Apogeotropism', 'Localized sensitivity to Geotropism in tips of Radicles', 'Pods burying themselves', 1877-10-30 - 1880-04-20 | Avena, 1878-09-18

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