000			00251nam a2200097 4500
082			_a551.701 _bGRA.G
100			_aGradstein, Felix.et.al.
245			_a Geologic time Scale 2004 _cGradstein, Felix.et.al.
260			_aCambridge _c2004 _bCUP
942			_cBK
999			_c337686 _d337686