• 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 the roots of certain plants': draft and fair copy, 1879-1881 | 'The action of carbonate of ammonia on the roots of certain plants', draft | Ms p 33

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