• Darwin Archive | 'Origin of Species': portfolios I | Materials for 'Natural Selection' chapter 4: 'Variation under nature' | NS I Chap 4-115 Printed Material, 1796-01-01 - 1861-12-31 | Henslow, John Stevens. Scales of Spruce fir cone '(private?)': [1, unpaginated], 1796-01-01 - 1861-12-31

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