00310nam a2200109Ia 450000500170000000800410001702000160005805000130007424500660008726000270015365000200018020251229175255.0251229s9999    xx            000 0 und d  a02169007778  aT 45 .L4 0aEnvironment and manb Energy rersources  and the environment.  aLondonb Blackiec1975  aEnvironment-Man