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_a338.4762138 _bLIT |
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_aLittlechild,S C _95240 |
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| 245 | _aElements of telecommunications economics | ||
| 260 |
_aLondon _bInstitution of electrical engineers _c1979 |
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| 300 | _axiii,268p. | ||
| 490 |
_aInstitution of electrical engineers telecommunications series _v7 |
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| 653 |
_atelecommunication system _aeconomics |
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