000			01088cam a2200253 a 4500
999			_c11156 _d11156
020			_a0870443364
082	0	0	_aCir 551.4 N21h 1981
245	0	0	_aHidden worlds
260			_a[Washington, D.C.] _bNational Geographic Society _cc1981.
300			_a104 p. : _bill. (some col.) ; _c28 cm.
504			_aBibliography: p. 103.
505	0		_aThink small / by Edith Kay Pendleton -- Beyond earth / by Kathryn Allen Goldner and Carole Garbuny Vogel -- The inside story / by Catherine O'Neill -- Wider horizons / by Eleanor Felder -- More light on the subject / by Kathryn Allen Goldner and Carole Garbuny Vogel -- Catch all the action / by Catherine O'Neill -- Who discovers hidden worlds? / by Glenn O. Blough.
526			_a500-599
650		0	_aVision — Juvenile literature.
650		0	_aMicroscopy — Juvenile literature.
650		0	_aTelescopes — Juvenile literature.
650		0	_aRadiography — Juvenile literature.
650		0	_aVision.
650		0	_aMicroscopes.
650		0	_aMicroscopy.
650		0	_aTelescopes
650		0	_aRadiography
942			_2ddc _cBK