00278nam a2200109Ia 4500008004100000041000800041082002200049100001400071245003100085260004400116300000800160211209s1978    xx            000 0 und d  aeng  a621.319 2 N78 RYD  aRYDER J D  aNETWORKS LINES AND FIELDS   aNEW DELHIbPRENTICE-HALL OF INDIAc1978  a605