00334nam a2200121Ia 4500008004100000082001800041100002700059245005900086260002600145300000900171630001800180650001400198211109s9999||||xx |||||||||||||| ||und||  a515.35bWEB-P  aWebster, Arthur Gordan 0aPartial Differential Equations of Mathematical Physics  bDoveraNew Yorkc1955  a440p  xGENERAL STACK  vGeneralia