00346nam a2200133Ia 4500008004100000100004200041245001900083250001200102260004400114300000800158650002400166942000700190999001500197190216s9999||||xx |||||||||||||| ||und||  a"Murrell. Jn, Kettle. Sf, Tedder. Jm" 0aValence Theory  a1st Ed.  bThe English Language Book Societyc1965  a428  aChemistry-Chemistry  cBK  c2164d2164