00289nam a2200109Ia 450000500170000000800410001708200140005810000170007224500480008926000340013730000080017120260225051021.0260224s9999||||xx |||||||||||||| ||und||  a620.1 BET  aAlbert Betz  0aIntroduction to the theory of flow machines  aLondon: Pergamon Press c1966  a281