000			00838cam a2200193Ia 4500
020			_a0717275183 :
040			_aJDP _cJDP _dBKL _dNVC _dMEY _dDIS
245	0	0	_aAir : _bthe invisible resource.
260			_aDanbury, Conn. : _bGrolier Educational Corp., _c1996.
300			_a8 v. : _bill., maps ; _e1 teacher's guide.
490			_aThe Grolier library of environmental concepts and issues.
500			_aIncludes indexes.
505	0		_av. 1. Ecosystem Earth -- v. 2. Air: the invisisble resource -- v. 3. Water: a finite resource -- v. 4. Energy -- v. 5. Living resources -- v. 6. Using the Earth's resources -- v. 7. The Earth's ecosystems -- v. 8. People and the environment.
650		0	_aEnvironmental sciences.
650		0	_aEnvironmental policy.
650		0	_aEcology.
650		0	_aConservation of natural resources.
942			_cBK
999			_c2510 _d2510