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008 | 210219s9999||||xx |||||||||||||| ||und|| | ||
082 |
_a621.385 _bB623P |
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100 | _aBiswas N N | ||
245 | 0 |
_aPrinciples of telegraphy _cBiswas N N |
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260 |
_aBombay _bMedia Promoter _c1986 |
||
300 | _ax,185 | ||
942 | _cBK | ||
950 | _o621.385 B623P | ||
999 |
_c1853 _d1853 |