00423nam a2200097Ia 4500080001800000100001800018245018300036260007600219300001100295583001900306  a19.01.02 H498  aHendley, Tony  aVideodiscs, compact discs and digital optical disks : an introduction to the technologies and the systems and their potential for information storage, retrieval and dissemination  bNational Centre for Information Media and TechnologyaHatfiefldGBc1985  a208 p.  c3/7/00kM2LMGR