• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Miscellany: photographs of experiments, notes on various topics, 1877-05-19 - 1881-09-15 | envelope 'F Muller not answered', 1873-01-01 - 1882-04-30 | envelope 'F Muller not answered' [plus note], 1873-01-01 - 1882-04-30

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