Methods of study in soil ecology: Méthodes d'étude de l'écologie du sol. Proceedings of the Paris symposium organized by Unesco and the International Biological Programme / Edited by J. Phillipson. Méthodes d'étude de l'écologie du sol. Phillipson, John, 1927- ed. Unesco. International Biological Programme. Soil ecology Technique Congresses. QH541.5.S6 M47 574.526 UNM Held in Nov. 1967. English and/or French. Includes bibliographies. [Paris] Unesco [1970] [1970] 1970 Text 303 p.: eng engfre Ecology and conservation, 2