00250nam a2200109Ia 4500008004100000041001200041082001100053100001500064245004900079260000600128650000600134221030s9999    xx            000 0 und d  aEnglish  a105.23  aH. V. Keer 0aPrinciples of the Solid Statecby H. V. Keer  c0  aB