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... This letter is no longer extant but it is cited in Six Kamtsang Gurus and Students written in the eighteenth century by Karma Zhenpen Gyatso (karma gzhan pan rgya mtsho) at the time of the Thirteenth Karmapa, Dudul Dorje (karma pa 13 bdud 'dul rdo rje, 1733–1797) ...
Read more from the biography of Tashi Namgyel