Dune

You can find the full titles and series info in NLS' Voyager catalog:

DB054949 = Dune. The Butlerian jihad
Series: Legends of Dune Seq: 1

DB057121 = Dune. The machine crusade
Series: Legends of Dune Seq: 2

DB059055 = Dune. The Battle of Corrin
Series: Legends of Dune Seq: 3

If you want to include them in the main Dune series as well, you could add them as seq .1, .2, and .3 to put them ahead of the House of Dune series.

This information should be in the MARC as well. If you'd like us to check your filters to make sure subtitle information is being pulled in, please send us an email and we'll look into it.