| 000 | 00325 a2200133 4500 | ||
|---|---|---|---|
| 020 | _a0749260467 | ||
| 082 |
_a621.382 _bOPE |
||
| 090 |
_c13482 _d19844 |
||
| 245 | _aBlock 8 Digital signals | ||
| 260 |
_aNorthampton _bOpen University _c1990 _g1990 |
||
| 300 |
_a58p. _c29cm |
||
| 650 | _aCommunications engineering | ||
| 942 | _cL | ||
| 999 |
_c41813 _d41813 |
||