Reverberation of Sound Tantra
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The Reverberation of Sound Tantra (Tibetan: སྒྲ་ཐལ་འགྱུར, Wylie: sgra thal 'gyur), is considered to be the root tantra of the seventeen tantras of the Menngagde (esoteric Instruction) class of the Tibetan Buddhist Dzogchen tradition.[1]
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These tantras are found in the Nyingma Gyubum ("The Hundred Thousand Tantras of the Ancients"), volumes 9 and 10, folio numbers 143-159 of the edition edited by Dilgo Khyentse (Thimpu, Bhutan, 1973) of the gting skyes dgon pa byang manuscript.[2]