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Contents (partly): Production-ecology and Functioning of Polar andAlpine Ecosystems, by Frans Emil Wielgolaski (with 1 figure and 6tables)/ Zonation in Arctic and Alpine Tundra and Fellfield Ecobiomes,by Eilif Dahl (with 8 figures and 3 tables)/ Dynamics of Desert Resources and Ecosystem Processes, by Clifford S.Crawford & James S.Gosz(with 9 figures)/ Evolution of Life-forms in Desert Plants, by Otto T.Solbrig (with 4 figures)/ The Conflict Between Development and NatureConservation, with Special Reference to Desertification, by KaiCurry-Lindahl/ The Nature of Tropical Forest Ecosystems, by Paul W.Richards (with 3 figures)/ The Future of Tropical Forests, by Jose I.Furtado & Kenneth Ruddle (with 1 figure and 9 tables)/ MarineEcosystems, by Norman B.Marshall/ Marine Environmental Protection-AChallenge to Ecologists, by Allan Hirsch/ Eutrophication Control with anEmphasis on Macrophytes and Algae, by Thomas L.Crisman (with 4 tables)/Recent Advances in Our Understanding of Stream Ecosystems, by Michael J.Winterbourn (with 2 figures and 1 table).