This section contains the Father Tantra literature associated with the Akṣobhya family. The most significant works here are the Guhyasamāja Tantra (D.443), along with its supplement (D.444) and its four main explanatory tantras (D.445-D.448). (Note that the texts D.449 and D.450 do not appear in Situ's catalog.)
Literature:
Wedemeyer, Christian. Aryadeva’s Lamp That Integrates the Practices. New York: Columbia University Press, 2007.