• Darwin Archive | Correspondence, largely with Darwin family members, and fragments or drafts relating to 'Origin' and 'Cirripedia' | Letter from John Stevens Henslow to Charles Robert Darwin; written at [place unstated], 1839-04-14
• Darwin Archive | Correspondence, largely with Darwin family members, and fragments or drafts relating to 'Origin' and 'Cirripedia' | Letter from William Herbert to John Stevens Henslow; written at Spofforth, 1839-04-05 | William Herbert to John Stevens Henslow, 1839-04-05

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