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999 _c18965
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008 190711s9999 xx 000 0 und d
020 _a0835912272
082 _a621.38415 S551
100 _aSherman, Kenneth
245 0 _aData Communications
_bA Users Guide
260 _aVirginia
_bReston publishing Company
_c1981
300 _a23X15
942 _cBK