00505nam a2200133Ia 4500 20260716043045.0 19.01.02 H498 Hendley, Tony Videodiscs, compact discs and digital optical disks : an introduction to the technologies and the systems and their potential for information storage, retrieval and dissemination National Centre for Information Media and Technology HatfiefldGB 1985 208 p. 3/7/00 M2LMGR M H498 39502 39502