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 but is generally considered spurious (see NCC). This manuscript contains the 18 paṭalas of the Pūrvārdha. It is written with five lines per folio, except from fol. 42b onward, where it shifts to six lines per folio.
Sarva-tathāgata-kāya-vāk-citta-rahasya-guhyasamāja (Guhyasamāja, pūrvârdha)' (Matsunami)
General Library, The University of Tokyo