The All-Illuminating Seminal Nucleus (Thig le kun gsal) is contained in The Collected Tantras of the Ancient Ones (Rnying ma rgyud ‘bum) which is an important collection of esoteric scriptures canonical to the Nyingma Order. Manuscripts from which this collection was printed were found at the monastery of Tsamdrak in western Bhutan. This edition comprises 46 volumes and was probably calligraphed in the 18th century.