000			00277nam a2200109 4500
082			_a553GP _bAHR.P;2
100			_aAhrens, L.H. et.al.
245			_aPhysics and Chemistry of the Earth. _cAhrens, L.H. et.al.
250			_aFifth
260			_aLondon _c1964 _bPergamon
942			_cBK
999			_c335341 _d335341