00607nam a2200181Ia 4500 CTU_67716 210402s9999 xx 000 0 und d 150 577 E17 Ecological indicators for the assessment of the quality of air, water, soil, and ecosystems: Papers presentyed at a symposium held in Utrecht, October 1982 Edited by E. P. H. Best and J. Haeck Dordrecht, Holland D. Reidel 1983 Biotic communities Minh Trung tâm Học liệu Trường Đại học Cần Thơ