The Dune Encyclopedia

From Author Wars - https://authorwars.com/publications/the-dune-encyclopedia-282484.html

Overview:

Title: The Dune Encyclopedia
Author: Willis E. McNelly
Year: 1984
Publisher: Berkley Books / SFBC
Pages: [2]+ix+526
Binding: Hardcover
Type: Non-fiction
Title Reference: The Dune Encyclopedia
Notes:
• First SFBC edition (not stated).
• First printing has gutter code "O46" [verified] on page 525, indicates a November '84 printing date.
• The artist is not credited, no visible signature. Looks like Vincent Di Fate's work
• There is an untitled 'introduction' on the first page [1] (precedes the roman numerated pages) by Frank Herbert.
• OCLC lists only the trade editions; Locus1 doesn't list this either