तैत्तिरीयोपनिषत्, अरुणप्रश्नम्, तृणाचिकेतम्
Complete sacred text comprising Shiksha Valli, Ananda Valli, Bhrigu Valli, full Aruna Prashnam (Surya Namaskara mantras with 130+ Anuvakas), and Trinachiketam with Vedic swaras, anunasika sandhi, and full chapter index.