00258nam a2200133Ia 4500020000900000082000800009100001900017245003600036250000900072260001800081300000800099500000800107650000900115  aNULL  a548  aPauling, Linus 4aThe Nature Of The Chemical Bond  a3 rd  aCalcuttabIBH  a644  a134  a-NA-