000			00482nam a2200157Ia 4500
008			140712s9999 xx 000 0 und d
020			_a1851660011
041			_aENG
080			_a628.19 _bHEL-B
100			_aHellawell, J. M.
245			_aBiological Indicators of freshwater pollution and environmental management
260			_c1986 _aLondon _bElsevier Applied Science Publishers
300			_axiii, 546
650			_aEnvironmental ManagementEnvironmental Policies
942			_2UDC
999			_c6998 _d6998