00302nam a2200109Ia 450000500170000000800410001708200120005810000150007024500510008526000480013630000080018420260224040958.0260224s9999||||xx |||||||||||||| ||und||  a540 LEE  aLee, G.L.  0aPrinciples of chemistry: a structural approach  aScranton, International Textbook Co. c1970  a713