The Guhyasamājatantra is one of the earliest Buddhist tantras of the Vajrayāna tradition. According to Tibetan sources, it originated in South India. The text is divided into two parts: the Pūrvārdha, consisting of 18 chapters (Paṭalas) and also known as the Aṣṭādaśapaṭala, and the Uttarārdha or Aparārdha, which contains 15 Paṭalas and is considered spurious. (see NCC). This manuscript contains the 18 Paṭalas of the Pūrvārdha, and the chapter titles correspond to those listed in Cecil Bendall’s catalogue entry for the Guhyasamājatantra (p. 15).
Sarva-tathāgata-kāya-vāk-citta-rahasya-guhyasamāja (Guhyasamāja, pūrvārdha)' (Matsunami)
General Library, The University of Tokyo