Compendium of Tantras
The Compendium of Tantras (Wyl. rgyud sde kun btus) is a vast collection of teachings and lineages from the whole range of the historic schools of Tibetan Buddhism, which was compiled by Jamyang Loter Wangpo.
There are 315 empowerments and 25 commentaries within the Compendium which include rare teachings from the Sakya, Gelug, Kagyu, Nyingma, Bodong, Dolpa, Jonang, Shyijé, Ogyen Nyengyü, and Kalachakra traditions. In the case of the Bodong, Dolpa, and Ogyen Nyengyü, in particular, were it not for their preservation in the Compendium of Tantras, these teachings and practices might have otherwise become extinct.
The famed Ngor collection of the 139 mandalas of the (Wyl. rgyud sde kun btus) was saved by Thartse Khen Rinpoche (1930-1988), who took them with him into exile from Tibet in 1958 and subsequently wrote the definitive work on them.