Pṛthvī
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Fordharma
→शब्दोत्पत्तिः ॥ Origin of Sound: added various angles as explained by Prof. Korada Subrahmanyam
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→शब्दोत्पत्तिप्रक्रिया ॥ Science of Speech Production: edited
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created page for origin and propagation of sound
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