000			00230nam a2200097 4500
999			_c335695 _d335695
082			_a550 _bGAS.U
100			_aGass I.G.et.al.
245			_aUnderstanding The Earth _cGass I.G.et.al.
260			_aSussex _c1971 _bArtemis
942			_cBK