000 00264nam a2200109Ia 4500
008 190704s9999 xx 000 0 und d
082 _a621.382 C2844
100 _aCARLSON,A.B
245 0 _aCOMMUNICATION SYSTEMS
260 _aAUCKLAND
_bMcGraw-Hill
942 _cBB
_2DDC
999 _c6895
_d6895