9 paperback Dune books. The first six are the original vintage Dune books written by Frank Herbert. The others are  The Butlerian Jihad trilogy written by Brian Herbert and Kevin J. Anderson.  Included are:

Dune

Dune Messiah

Children of Dune

God Emperor of Dune

Heretics of Dune 

Chapterhouse Dune

The Butlerian Jihad

The Machine Crusade

The Battle for Corrin

Some books have some wear on the spine; otherwise, the books are all in very good condition.  The pages of all the books are tight, clean and in good condition.