00259nam a2200109Ia 4500008004100000041000800041082002200049100001500071245003700086260001800123300000800141211209s1977    xx            000 0 und d  aeng  a541.2 N79 CAR/FOW  aCARTMELL E  aVALENCY AND MOLECULAR STRUCTURE   bE L B Sc1977  a348