Two Nepali rare manuscripts have been listed on the Memory of the World Register of United Nations Educational Scientific and Cultural Organization (UNESCO). Nisvasattatva samhita, the earliest tantric manuscript, and the Susruta samhita (Sahottartantra), the oldest document on Ayurveda medicine, have been added to the prestigious list, confirming their outstanding value. According to UNESCO, these two manuscripts are among the 54 new additions to be added to the Memory of the World Register by UNESCO. They were selected because of their uniqueness and importance for the world.

The manuscript Susrutasamhita is 1134 years old which is written in Sanskrit on palm leaves. The manuscript is at Kaiser Library In Kathmandu. According to Janaki Karmacharya, chief of Kaiser Library, it is also considered as the oldest document in the field of Ayurveda medicine. The Nisvasattatvasamhita manuscript is the oldest and an important source of tantrism which is deposited at the National Archives. It has had a great influence in shaping other tantric texts and is supposed to be written in the 8th century.