Decrypting a 500 year-old document from a distant planet is like looking for a needle in a haystack. You can see some of the themes from Dune in their infancy here.
Isaac Asimov, Ray Bradbury, Philip K. Dick, Andre Norton, Harry Harrison, Keith Laumer, Frank Herbert, H. Beam Piper, Marion Zimmer Bradley & Fritz Leiber
Ray Bradbury, Various Authors, Murray Leinster, Lester del Rey, Harry Harrison, Frank Herbert, Marion Zimmer Bradley, Poul Anderson, Fritz Leiber, Ben Bova & Steppenwolf Press
Mark Clifton, Alex Apostolides, C. M. Kornbluth, Jerome Bixby, Russell Burton, Walter Bupp, Raymond Jones, Arthur Feldman, Murray Leinster, Allan Danzig, Bradner Buckner, Stephen Barr, Mack Reynolds, Milton Lesser, Sterner Meek, Frank Banta, Frank Herbert, H. Beam Piper, Francis Stevens, Fritz Leiber, James Schmitz & Robert Abernathy
Kevin J. Anderson, Ron Collins, David Farland, Frank Herbert, Phaedra Weldon, Dayle A. Dermatis, JC Andrijeski, Peter J. Wacks, Patrick O'Sullivan, Thomas K. Carpenter, Jamie McNabb, Brigid Collins, Kristine Kathryn Rusch, Chuck Heintzelman & Dean Wesley Smith
Murray Leinster, Robert Sheckley, Jack Huekels, Neil R. Jones, Harry Harrison, Keith Laumer, Frederik Pohl, Frank Herbert & Amazing Sci-Fi Classics-020edt