Pahlavi Texts, Part IV (SBE37), E.W. West, tr. [1892], at sacred-texts.com
The first half of this Nask (as described in Dk. VIII, Chap. XI, 1, 2) appears to be still extant in the Vistâsp Yast, 1-44; but the remainder of that Yast does not correspond with the description of the latter half of the Nask.
468:1 As half this Nask consists of the Vistâsp Yt. 1-44, which contains about 1,100 Avesta and 3,600 Pahlavi words, the contents of the whole Nask may be estimated at about 2,200 Avesta and 7,200 Pahlavi words.