00345nam a2200109Ia 4500008004100000082001900041100001700060245001200077260004200089630002800131650007600159211109s9999||||xx |||||||||||||| ||und||  a541.396bCOU-V  aCoulson, C A 0aValence  bOxford University PressaLondonc1961  xPOST GRADUATE REFERENCE  aValence (Theoretical chemistry)vPhysical chemistryChemistryxChemistry