Extracted from pg 161- 162 of Enlightened Beings: Life Stories from the Gaden Oral Tradition by Janice D. Willis and published by Wisdom Publications.
114 The Tibetan given throughout these namthar for Great Miraculous Volume is sprul pa'i glegs bam chen mo. The giving over of the Miraculous Volume marks the "seal" of transmission and attests to the perfected realization of a disciple. As might be expected, the Miraculous Volume is not an ordinary book. According to the Gelukpa tradition, it is quite invisible and of the nature of light. There is a humorous story told about how the first Panchen Lama, Losang Chokyi Gyeltsen, kept an "empty" space on his bookshelves. When it was asked why he did this, one of the Panchen's disciples replied, "That is where the Miraculous Volume is kept."
Some Geluk masters assert part of the bLa-ma mchod-pa [the Gelukpa's most comprehensive liturgical text, composed by the First Panchen, was taken directly from the Great Miraculous Volume. Others maintain that the Volume is synonymous with the King Tantra itself, the Guhyasamaja Tantra, especially as explicated by Tsongkapa. Whatever the actual content of the Volume, it is viewed as most precious and as encompassing the whole pith Tantric teachings given directly by Lord Manjushri to Tsongkapa. These make up the Gaden Oral Tradition of Mahamudra practice.
The Gelukpa history of the respective human recipients of the Miraculous Volume is shrouded in mystery. The standard Gelukpa Mahamudra lineage as we now have it comes down to the present. However, there are at least two differing traditions regarding who was the last Geluk siddha to actually receive and hold the Miraculous Volume. One tradition asserts that Kachen Yeshe Gyeltsen [given as no. 16 of the present lineage and compiler of the namthar anthology from which the present translations are derived] was the last recipient. He is said to have returned the Volume, for safekeeping, to the Ganden gods. This tradition asserts that Pabongka Rinpoche, Trinley Gyatso [no.33 of the lineage], using his powers of insight, then set forth the extended lineage, composing the prayer that gives the lineage up to His Holiness Trijang Rinpoche.
An alternate tradition maintains that the First Panchen himself was the last human to hold the Miraculous Volume and that he returned it to the gods for safekeeping. As to which particular Ganden god the Volume was entrusted to at that time, there are varying opinions. The most common speculation says that the Volume was returned to the wrathful protector Kalarupa. Another view asserts that the Volume was bound over to the protection of Dorje Shukden (rDo-rje Sugs-ldan).
Of the six namthar presented here, the Great Miraculous Volume is explicitly mentioned only in the first four: the lives of Jampel Gyatso, Baso Chokyi Gyeltsen, Chokyi Dorje and Gyelwa Ensapa.