This article is from the Dune FAQ, by Alan Schwartz with numerous contributions by others.
"The Notebooks of Frank Herbert's Dune", Brian Herbert (ed.),
New York : Perigee Books (1988). Binding: Paperback.
ISBN: 0-399-51466-X.
"Songs of Muad'Dib: poems and songs from Frank Herbert's Dune
series and his other writings", Brian Herbert (ed.),
New York : Ace (1992).
 
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