00418nam a2200145 a 450000500170000000800410001702000180005804100080007608200120008410000250009624500540012126400640017530000150023970000180025420260717092200.0260717s2008    ii            000 0 eng d  a9780074636824  aeng04a621.3821 aRoddy, Dennis, 1931-10aElectronic Communications /cRoddy, Dennis, 1931- 1aNew Delhi :bDorling Kindersley (India ) Pvt. Ltd.,cc2008.  aix, 723 p.1 aCoolen, John.