00314nam a2200109Ia 450000500170000000800410001708200160005810000150007424500600008926000470014930000080019620260225050938.0260224s9999||||xx |||||||||||||| ||und||  a621.319 COT  aH. Cotton  4aThe transmission and distribution of electrical energy   aIslamabad: National Book Foundation c1970  a472