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Hand-drawn graph showing variation in the Baltimore oriole

Manuscript graph by Wallace, on variation in the Baltimore oriole bird for his book on Darwinism, undated, probably 1888.

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Wallace Letters Online

Letter to Alfred Russel Wallace from the Royal Society, about his Darwin Medal award

View high resolution scans and transcripts of Alfred Russel Wallace's correspondence, including all surviving letters between him and Charles Darwin.

Explore Wallace's correspondence