• Darwin Archive | 'Origin of Species': portfolios I | Materials for chapter 8: 'Transition of organs' | 'Natural Selection' Portfolios, notes for chap. 8, 'Transitional varieties' | NS I Chap 8-5 Abstract, 1854-01-01 - 1882-04-30 | 'Trans Zool Soc' 6: [pp?], 1854-01-01 - 1882-04-30

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