00305nam a2200097Ia 450000500170000000800410001708200160005810000180007424500820009226000330017420260329235403.0260329s9999||||xx |||||||||||||| ||und||  a650.1 K811E  aKoch, Richard 0aEighty / twenty principle : the secret to success by achieving more with less  aNew YorkbCurrency pubc1998