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020 _a9788123752570
041 _aeng
082 _a577
_bRAM/E
100 _aP S RAMAKRISHNAN
_9373
245 _aECOLOGY AND SUSTAINABLE DEVELOPMENT
_bWORKING WITH KNOWLEDGE SYSTEMS
_cP S RAMAKRISHNAN
260 _aNEW DELHI:
_bNBT,
_c2004.
300 _a217 p.
942 _cTB