• Darwin Archive | 'Origin of Species': portfolios I | Materials for chapter 11: 'Geographic distribution' | Glaciers Portfolio (DAR 50E) | NS I Glacial Period-31 Letter, 1856-11-10 - 1882-04-30 | Charles Robert Darwin to [Sir Joseph Dalton Hooker?], 1856-11-10 - 1882-04-30

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