00290nam a2200121Ia 4500008004100000020001800041041000700059082001000066100001300076245003900089260003000128300001000158180612s9999||||xx |||||||||||||| ||und||  a0-582-01637-1  aen  a333.7  aKNAPP BJ 0aChallenge of the human environment  aU. KbLongman Groupc1989  a272P.