The Sakya Monastery of Tibetan Buddhism is happy to provide this archive of documents, including rare recordings, PDFs and more.
A collection of quotes by great masters on the practice of Chenrezi and his Six-Syllable Mantra, compiled by H.E. Sakya Khöndung Asanga Rinpoche (PDF)
Ocean of Compassionate Activity: an Instruction in the meditation of the great compassionate one, Chenrezi. Written by by H.H. Jigdal Dagchen Dorje Chang
Crystal Dewdrops from the Lotus Petal: a Brief Biography of HH Jigdal Dagchen Sakya and the Importance of the Six Syllable Mantra, by H.E. Sakya Khöndung Asanga Rinpoche
2/14/16 H.E. Khondung Asanga Vajra Rinpoche gave a brief talk before offering the Amitayus-Hayagriva Initiation (audio file) by H.E. Sakya Khöndung Asanga Rinpoche
Taking Refuge (PDF) by H.E. Sakya Khöndung Asanga Rinpoche
Understanding Buddha Nature (PDF) by H.E. Sakya Khöndung Asanga Rinpoche