Though some ancient lists note over 60 titles of apocryphal and pseudepigraphal works, by the early twentieth century R.H. Charles was able to offer only 17 such works for publication in volume 2 of his The Apocrypha and Pseudepigrapha of the Old Testament (Oxford: Clarendon Press, 1913) and two of these, Pirke A both and The Fragments of a Zadokite Work, clearly belong within the rabbinic corpus and the Dead Sea Scrolls respectively. Charlesworth includes 65 texts, many for the first time in English. 1 The net result is that the Charlesworth edition of the Old Testament Pseudepigrapha contains far and away the most extensive collection of texts and the highest concentration of deep scholarship on the subject to appear in history.
Delamarter, Steve, "Introduction to A Scripture Index to Charlesworth's Old Testament Pseudepigrapha" (2002). Faculty Publications - Portland Seminary. 85.