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005 20250225145338.0
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082 _a621.380414 GO -O
100 _aJohn, Gowar
245 0 _aOptical communication systems
_c GowarJohn
250 _a2nd
260 _aNew Delhi
_bPHI
_c1993
300 _axvi;696
650 _aOptical communication systems
_943601
942 _cBK
999 _c30478
_d30478