00460nam a2200145 a 450000500170000000800410001702000180005805000220007624500110009826000690010930000110017850000280018952000870021765000100030420140513081048.0020906s19uu    xx            00    eng d  a1-919736-04-2  aP 534.2bSOU 2000  aSound.  aJohannesburg, South Africa :bThe Chart Studio (Pty) Ltd,c2000.  aPoster  aSources of sound & etc.  aSound is a form of energy which makes it possible to hear speech, noise and music.  aSound