This is the six-volume set, consisting of:
Vol 1, Shankara on the Absolute (ISBN 0-85424-055-1/978-0-85424-055-5)
Vol 2, Shankara on the Creation (ISBN 0-85424-056-X/978-0-85424-056-2)
Vol 3, Shankara on the Soul (ISBN 0-85424-057-8/978-0-85424-057-9)
Vol 4, Shankara on Rival Views (ISBN 0-85424-058-6/978-0-85424-058-6)
Vol 5, Shankara on Discipleship (ISBN 0-85424-059-4/978-0-85424-059-3)
Vol 6, Shankara on Enlightenment (ISBN 0-85424-060-8/978-0-85424-060-9)

The six volumes in this set are also available individually.