000 00279nam a2200133Ia 4500
003 IN-KoSCC
008 211107s9999 000 0 eng
082 _a541-65
100 1 _aFriend,J.N
245 1 _aTheory of valency
260 _c1909
653 _aChemistry
942 _cBK
999 _c37932
_d37932