000 00337pam a2200133a 44500
008 230405s1987 xxu||||| |||| 00| 0 eng d
041 _aENG
100 _ataub herbert
245 _aprinciples of communication systems
260 _a
_bMc Graw Hill Book Company
_c1987
300 _a759
700 _aschilling donald L
906 _a1137
999 _c292480
_d292480