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Using Group Amplification in the Classroom by Pamela Schlitt Ana Paula G. Souza Sabrina Strudwick. - ppt download
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SHIDU Portable Rechargeable Voice Amplifier with Wired Neckband Microphone, Supports AUX, USB & Micro-SD Card Input for Teachers, Tour Guides, Coaches, Classroom, Singing, Yoga, Fitness Instructors : Amazon.in: Musical Instruments
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