00505nam a2200133Ia 450000500170000008000180001710000180003524501830005326000760023630000110031258300190032394200120034299900170035420260716043045.0  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  cMmH498  c39502d39502