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| 901 | 0 | 0 | _aENG |
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| 250 | 0 | 0 | _a2nd Ed. |
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| 245 | 0 | 0 | _aIntroduction to Digital Communications Switching |
| 100 | 0 | 0 | _aRonayne, John |
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_aAllahabad _bWheeler Publishing _c1992 |
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