TY - BOOK TI - The formation of vegetable mould, through the action of worms : with observations on their habits UR - https://www.biodiversitylibrary.org/item/59349 PB - John Murray, Albemarle Street CY - London PY - 1897 N1 - First edition, 1881. --- "Thirteenth thousand." --- "With illustrations." --- Includes index. --- Spine title: Vegetable mould and earth-worms. AU - Darwin, Charles, KW - Humus KW - Oligochaeta KW - Soil formation ER -