The formation of vegetable mould, through the action of worms, with observations on their habits Darwin, Charles, 1809-1882 creator text book New York Appleton 1882 1883
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ENG First edition, 1881. Earthworms Humus Soils QL394 .D25 https://www.biodiversitylibrary.org/bibliography/20388 7298675 10.5962/bhl.title.20388 MOD