00495nam a22001697a 4500008004100000020001800041040005500059080001500114100002600129245004500155260005400200300001000254650001300264653001900277942001200296999001700308230615b        |||||||| |||| 00| 0 eng d  a0-02-946062-X  aNational Science LibrarycNational Science Library  a621.39bN0  aCouch, Leon W 911731  aDigital and analog communication systems  aNew York: bMacmillan Publishing Company,  c1990  a766p.  aDigital   aCommunication   2udccBK  c43551d43551