• Darwin Archive | Papers, drafts and fair copies of Darwin's papers on the action of carbonate of ammonia and a draft of his preliminary notice on Van Dyck's paper on Syrian street-dogs, 1879-1881 | 'The action of carbonate of ammonia on chlorophyll bodies': draft and fair copy and 'Preliminary notice' to Van Dyck's 'On the modification of a race of Syrian street-dogs by means of sexual selection': draft, 1879-1881 | Front Cover (Inside)

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