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_aAbrahams, John R _917824 |
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| 245 | _aManager's guide to centrex | ||
| 300 | _aviii,106p. | ||
| 653 |
_aTelephone exachages _aISDN(Intergrated services digital network) |
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| 942 | _cBK | ||
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_aNorwood _bArtech house _c1998 _917825 |
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