Sound 32 Juvenile literature 12 Computer sound processing 8 High-fidelity sound systems 8 English language 6 Recording and reproducing 6 Sound recording for foreign speakers 6 Equipment and supplies 5 Experiments 4 Architectural acoustics 3 Light 3 Music 3 Absorption of sound 2 Acoustical engineering 2 Auscultation 2 Computer storage devices 2 Dictionaries 2 Human-computer interaction 2 Lungs 2 Maintenance and repair 2 Optics 2 Problems, exercises, etc 2 Radio 2 Respiratory Sounds 2 Self-instruction 2 Signal processing 2 Sound recordings for English speakers 2 Sound-waves 2 Sounds 2 Underwater acoustics 2