How does the བར་དོ་ཐོས་གྲོལ (Bardo Thodol) "Tibetan Book of the Dead" fit in with the Kangyur and Tengyur
The Bardo Thodol is an extract from the Guhyagarbha tantra, which is the most important tantra in the Mahayoga class, and the most studied tantra within the Nyingma school. The Guhyagarbha is certainly in the Kangyur.