000			00363nam a2200157Ia 4500
008			200204s9999 xx 000 0 und d
082			_aH 333.707
100			_a"Vyas, Harishchandra"
245		0	_aParyavaran shiksha
260			_aNew Delhi
260			_bVidhya Vihar Prakashan
260			_c1992
300			_a288p.
650			_aEnvironments
942			_cBK
999			_c46079 _d46079