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| 999 |
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| 005 | 20200128130047.0 | ||
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| 020 | _a0333476271 | ||
| 040 | _cLOC | ||
| 100 | _aAllen John | ||
| 245 | 0 | _aTelecommunications | |
| 250 | _a1990 | ||
| 260 | _bMacmillan Education Ltd./ Hampshire | ||
| 650 | _aTelecommunication - Periodicals | ||
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