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020 _aERNET
040 _aMAIN
082 _a335
100 _aCCITT
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245 0 _aBLUE BOOK,VOLUME VII,FASCICLE VII.2: TELEGRAPH SWITCHING SERIES U RECOMMENDATIONS, IXTH PLENARY ASSEM
260 _bITU
_c1989
_aGENEVA
300 _b2887
500 _aSC-021
942 _cBK
999 _c41629
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