topics common to all schools of Tibetan Buddhism and could be classified as a Lamrim type work according to Germano. The Treasury of Pith Instructions (Tib. མན་ངག་མཛོད་, Mengak Dzö; Wyl. man ngag mdzod, MND), a short text which consists of advice for meditative contemplation and which only deals in passing with Dzogchen topics. The Treasury of Philosophical Systems (Tib. གྲུབ་མཐའ་མཛོད་, Drubta Dzö; Wyl. grub mtha' mdzod, GTD), a work of the "tenets" ( grub mtha', Skt. siddhanta) genre which gives a systematic and doxographic account of the various Buddhist philosophical views. Longchenpa uses the nine yanas schema in this work to discuss the various Buddhist philosophies, and naturally places Dzogchen at the pinnacle. The Treasury of Word and Meaning (Tib. ཚིག་དོན་མཛོད་, Tsik Dön Dzö; Wyl. tshig don mdzod, TDD), a shorter overview of Dzogchen thought and practice which follows the outline of the "eleven vajra topics". The Treasury of the Supreme Vehicle (Tib. ཐེག་མཆོག་མཛོད་, Tekchok Dzö; Wyl. theg mchog mdzod, TCD), a large commentary on all topics of the Dzogchen tradition found in the Seventeen Tantras which provide a wide ranging and systematic account of Dzogchen that goes into much more detail than the Tsik Dön Dzö. The Treasury of the Dharmadhatu (Tib. ཆོས་དབྱིངས་མཛོད་, Chöying Dzö; Wyl. chos dbyings mdzod, CBD), a poem with a prose commentary called the Treasure Trove of Scriptural Transmissions (lung gi gter mdzod). This is a free ranging poetic work which discusses Dzogchen topics in much less comprehensive manner. Accoriding to Germano this can be seen as "a hymn to the mind of enlightenment (which is synonymous with the Great Perfection)." The Treasury of the Natural State (Tib. གནས་ལུགས་མཛོད་, Neluk Dzö; Wyl. gnas lugs mdzod, NLD), a poem with its prose commentary, the Desum Nyingpo (sde gsum snying po). This work mainly discusses the four samayas or commitments of Dzogchen (ineffability, openness, spontaneous presence, and oneness). According to Germano, the Tsik Dön Dzö and the Tekchok Dzö together constitute Longchenpa's primary scholastic work on the Dzogchen tradition. Nyingthig Yabshi Longchenpa compiled various Dzogchen Menngagde scriptures (including the Seventeen Tantras) into the collection known as the Nyingthig Yabshi (The Inner Essence in Four Parts). In this compilation, Longchenpa combines his editions of the Vima Nyingtig and the Khandro Nyingthig, along with his own commentaries on these cycles (the Lama Yangtik and the Khandro Yangtik respectively). Longchenpa also composed a supplementary commentary to the Nyingthig Yabshi, called