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Introduction to environmental engineering
P. Aarne Vesilind, Susan M. Morgan, Lauren G. Heine
Soil erosion in the European Community : impact of changing agriculture : proceedings of a seminar on land degradation due to hydrological phenomena in hilly areas : impact of change of land use and management/Cesena/9-11 October 1985
edited by G. Chisci, R.P.C. Morgan ; sponsored by the Commission of the European Communities, Directorate-General for Agriculture, Coordination of Agricultural Research