Due July 31, the project features a companion disc of bonus material, including an unreleased rough mix of every track from the original album with early versions including working titles such as "The Hook" ("All My Love"), "The Epic" ("Carouselambra") and "Blot" ("I'm Gonna Crawl").

Led Zeppelin's eighth album, "In Through The Out Door" hit No. 1 on both sides of the Atalantic, topping the UK charts and the US Billboard 200 on its way to selling more than 6 million copies in the States alone.

The project is one of three albums set to be released that will wrap up a year-long reissues campaign by the group; also due are 1976's "Presence" and 1982's "Coda."