• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Miscellany: photographs of experiments, notes on various topics, 1877-05-19 - 1881-09-15 | 'Bordeaux Soc Sci mém' 4 1866: 11, 25, 31-43, 1866-09-13 - 1882-09-21 | 'Bordeaux Soc Sci mém' 4 1866: 11, 25, 31-43, 1866-09-13 - 1882-09-21

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