The Dune Trilogy

From Author Wars - https://authorwars.com/books/the-dune-trilogy-2554216.html

Overview:

Title: The Dune Trilogy
Author: Frank Herbert
Year: 1979
Type: Omnibuses

Editions/Publications:

Unknown. The Dune Trilogy (Unknown, Frank Herbert, New English Library, $4.00, 510+222+380 pages, Paperback, Omnibus)