Ok... I take the time to type what Fulves wrote in his bibliography.....
Fulves lists three booklets in his bibliography that are entirely on the faro shuffle and don't really fit the topic in my opinion (Faro Possibilities, Bonfeld's Faro Concepts, The Return Trip). The riffle shuffle manuscripts are in chronological order:
Faro & Riffle Technique
Faro Transforms, Gray Codes, Interlocking Stacks, Displacements, Locating the Aces, Triple Faro, Mechanical Controls, The Gray Liar, Unit Transpo, The Interrogation Technique, Block Transfer, Negative Block Transfer, Double Transfer, Stripper Controls, routines by Zavis, Walton, Neale
Riffle Shuffle Set-Ups
A riffle shuffle set-up is one which produces controlled results even though the spectator gives the deck an honest riffle shuffle. Contributors include Marlo, Gardner, Hudson, Johnsson, Walton, Schmidt, Finnell, Johnson, Sarles, Krenzel, Jordan, Thompson Jr.
Gambler's Third Lesson
Card stacking demo which gives the spectator a good hand and the dealer an even better hand.
Riffle Shuffle Technique - Preliminary Notes to Part One
contains definitions of terms, continuous push-thru, modified Zarrow Full Deck Control, Block Transfer Shuffles, shuffles problems.
Riffle Shuffle Technique - Part One
is devoted to Zarrow's Full Deck Control, with contributions from Walton, Southall, Dingle, plus the Zarrow Transfer Shuffle.
Riffle Shuffle Technique - Preliminary Notes to Part Two
contains Cop From The Shuffle, Tabled Deck Controls, a discussion of blocking off, The Fake Insertion, and Derek Dingle's Roll Over Aces.
Riffle Shuffle Technique - Part Two
is devoted to the Dad Stevens Control, with contributions from Braue, Vernon, and Jennings ('Gambler's Aces').
Riffle Shuffle Technique - Part Three
opens with Avis' notes on Daley's Strip Out Shuffle, Gardner on the Daley red/black shuffle, Bush's description of Oeink's false shuffle, Vernon's Diamond Mental, and Avis on the Zarrow shuffle. The next chapter deals with Run-Up Systems (Searle's 'Las Vegas Shuffles,' Avis on Dr. Elliott's run-ups, Harry Green's one shuffle stacking, and Walton's double ended run up). There is a chapter on the overhand shuffle systems of Jim Wheeler, Avis and Dan E. Mayers, a chapter on block transfer shuffles, and a chapter on the restacking problem.
A discussion of riffle shuffle set-ups, including the Diagonal Rleationship, Nexto, Memory Mix, Chain of Events, Smart Modern, Shuffle DIagrams, Scribble Shuffles, Reverse Riffle Shuffles.
Riffle Shuffle Methods
Scarne's Shuffle Control, Any Named Ace, Tropp's Cop, False Shuffles (Erdnase, Hilliard, Larsen & Wright, Victor, Sarles), shuffle tricks.
Block Transfer Mathematics
Advertised but never released. An extract formed the chapter on the restacking problem in Riffle Shuffle Technique III.
Riffle Shuffle Control
Nearly self-working control that starts with two halves of the deck riffled together but not squared. Text includes Double Selection, Riffle Placement, Mathematical Triumph, Perfect Speller, with contributions from Robertson, Swinford, Rosenthal and Tropp.
Commentary on some of Marlo's claims re the so-called Shank Shuffle.
Riffle Shuffle Controls - Part One
is entitled Setting Up Exercises; a treatise on run-up systems, and includes chapters on Hold Backs, The Even Riffle, Drop Offs, Pre-Established Breaks, Shuffle Controls (Zarrow Faro Shuffle, Perfect Riffle Shuffle, Speed Shuffling) and a chapter on advanced shuffle work.
Riffle Shuffle Controls - Part Two
deals with blocking off and includes chapters on The Riffle Glimpse, Blocking Off Defined, More Block Controls, Card Effects, Cull/Stock Shuffles, No Breaks/ No Looking, Cut Controls and Gambling, Numerous routines by Scarne.
Puuh... That's is.
Concerning your question on the difference between the Preliminary Notes and the actual parts: The first two parts are a few pages in the design of a single issue of Epilogue but the preliminary notes and part three are thicker booklets and stand on their own. The pages are numbered from the first preliminary notes to part three which ends with page 201.