I've read the Apocalypse of Ezra (aka 4 Ezra, 2nd Esdras) quite a few times. It's included in the Oxford editions of the Bible (pretty much my main go-to biblical translation/source, though I'm acquainted with numerous others). This edition I hadn't read all the way through, even though it's been in my library quite a few years. I don't even remember where I got it, but it's old enough to not to have an ISBN number. The printed date says 1917. If it's really that old, it's in pretty good shape. Apparently, it was in a synagogal library at some point, or at least the stamp "Congregation of Kol Shofar," indicates such. The publisher intended it to be used by Christians though; the publisher is titled, "Society for Promoting Christian Knowledge."
Anyways, apocalypticism is a special interest of mine. When first becoming a Christian, I was really taken with two streams of Christian theological thought: the apocalyptic and the mystical. While these are both highly intuitive streams, there is a difference. The apocalyptic is almost always specifically a communal message, the mystical is almost always primarily personal. Both may utilize mythology (often the apocalyptic a bit more) and symbolism. And invariably, it's one person that receives the message. But the messenger in apocalyptic thought is always directed to share the message with the larger community. Also, some angel is almost always associated with apocalyptic messages. Mystical revelations are more directly personal. Kabbalistic texts are a bit more ambiguous, but they are also late comparatively.
4 Ezra is often included in the deutero-canonical texts. It is almost certainly 1st or 2nd century, thus it is pseudopigraphical. But it is a profound work. It is an incredibly rich text - only equaled by the Apocalypse of Baruch and the Enochic literature. All of these have much in common. I don't want to make this review over-long, but these are essential texts in apocalyptic thought. One does learn a lot through the study of these works. I highly recommend them. Apocalyptic thought is really only understood through acquaintance with the assorted literature. This is an essential text of that literature. Much recommended.