00261nam a2200109Ia 4500008004000000041000800040082001500048100002100063245002400084260003500108300000800143210210b1949   xxu||||| |||| 00| 0 eng d  aeng  a540.2 BIRH  aBIRCH (Arthur J)  aHow chemistry works  aLondonbSigma Books Ltd.c1949  a218