Among the Apocrypha of the Latin Vulgate, there is a certain book, called Second Esdras, which is found neither in the Masoretic Text, nor in the Greek Septuagint. Its first two and last two chapters are independent sections, called the Fifth and Sixth Books of Ezra, while the middle portion, spanning from the third to the fourteenth chapters, forms what is usually labeled as Fourth Ezra.
I would like to post a question about the sources of the book's first section, and related textual criticism, but am unsure whether the community might consider it on-topic; and, if not, would anyone have any suggestions on where to post such a question ?