This 6 LP set was released to commemorate the band's 20 years in the music business. It included a biography and discography booklet and the five full-length albums:
Electronic Meditation (1970)
Alpha Centauri (1971)
Green Desert (1973, released 1986)
Green Desert was released for the first time in this set.
US issues were a limited edition of 5000 featuring a cover artwork completely different from the UK release. To date there has been no CD release of this boxed set.