The book is published either as a muscle - wrenching single volume of more than 1200 pages, or more conveniently as two separate volumes. (newscientist.com)
Here are mentioned sets, or series of volumes, or single volumes which contain translations of some parts of that literature. (religion-online.org)
Viz Media originally announced the license at New York Comic Con 2011 but had only stated plans to release the series in single volume books starting where Tokyopop had left off (volume nine). (kuriousity.ca)