000			00801cam a22003011 4500
100			_aHeller, Robert L. ( Robert Leo ) , 1919-
041			_aeng
245			_aEarth science
250			_a2d ed.
260			_bWebster Division, McGraw-Hill
260			_aNew York
260			_c1979
260			_cc1979
270			_dUS
300			_axi, 468 p. :ill. ;26 cm.
440			_aChallenges to science
245			_cRobert L. Heller ... [et al.].
500			_aIncludes index.
020			_a0070280371
650		0	_aEarth sciences -- Juvenile literature.
650		0	_aAstronomy -- Juvenile literature.
650		0	_aEarth sciences.
650		0	_aAstronomy.
650		0	_xQE
050			_aQE29.E27 1979
942			_cPRINT
999			_c70734 _d70734
970			_a51 _bMohamad Barham _c51 _dMohamad Barham