000			00419nam a2200157Ia 4500
003			NIELib
008			211019s9999||||xx |||||||||||||| ||und||
020			_a356041085
082			_a507.07 _bRIC
100			_aRichards, Roy _95477
245			_aHoles,gaps and cavities stages 1 & 2
260			_bMacdonald Educational, _c1973. _aLondon :
300			_a90p.; _bill.; _c22cm
650		0	_91859 _aScience
942			_2ddc _cSR
999			_c15626 _d15626