parisattack: Books on the French (in English)
This is a preliminary list; I still have a few sources to check. But additions appreciated!
There are also quite a few in foreign languages and one should at least be noted and included in any basic French library - Schwarz's famous 'Green Book' Franzosische.
Those asterisked are my personal favorites of the 50 or so of these I have in my collection:
Bickford/Salome - Advance Variation of the French Defense
Bickford - Advance Variation of the French Defense 1
Bickford - Advance Variation of the French Defense 2
Bickford - Milner-Barry Gambit
Chess Charts - French Defence: A Statistical Analysis
Chess Digest - French Defense
Collins - The French Advance
Dempsey - French Winawer: Alekhine Gambit
Eades: Remember the MacCutcheon
Eingorn/Bogdanov - Chess Explained: The French
Emms - The French Tarrasch
Euwe: Theory of the Chess Openings: French Defence
Forintos - Play the Advance French
Gikountintas -- Trends in the Advance French 2
Gligoric/Uhlmann - The French Defence *
Gligoric - French Defense: RHM Survey
Grefe/Silman - French Defense for Black
Gufeld/Stetsko - The Classical French
Gufeld - The Modern French Tarrasch
Harding - Four Gambits to Beat the French
Harding - French: MacCutcheon and Advance Lines
Harding/Heidenfeld - French: Classical Lines
Horton - French Defence 1
Jacobs - French Classical *
Jacobs - Trends in the Classical French
Keene/Taulbut - French Defence: Tarrasch Variation
Kennedy/Sheffield - The Marshall Gambit in the French
Kosten - French Advance
Kovacevic - Trends in the French Winawer 2
Kugilowski - Developments in the French 1986-1987
Kuligowski - French Defence
Lane - Beating the French
Luccioni - French Defence: Tarrasch Variation 3. ...a6
Lutes - French Defense: McCutcheon Variation
Maksimovic -- The Modern French: Complete Guide for Black *
Martin/Lalic - Trends in the French Tarrasch 1, 2 - Martic/Lalic
Martin - Trends in the Advance French 1 - Martin
Martin - Developments in the French 1984-1985
Martin - The French Winawer: A Line for Black
McDonald - Trends in the French Winawer 1 - McDonald
McDonald - French Winawer: Main Lines (Batsford) *
McDonald - French Winawer (Everyman)
Minev - French Defense: New and Forgotten Ideas
Moles - French Winawer: Auxiliary Lines *
Moskalenko - The Wonderful Winawer *
Moskalenko - The Flexible French *
Nesis - Tactics in the French
Nikolic - French: Advance Variation
Papa - The Papa Gambit in the French
Pederson - The Main Line French 3, Nc3
Pederson - French: Tarrasch Variation
Pederson - French Advance and Other Lines
Psakhis - Advance and Other Anti-French Variations *
Psakhis - French 3. Nd2 *
Psakhis - French - 3. Nc3, Bb4 *
Psakhis - French - Steinitz, Classical and Other Systems *
Psakhis - The Complete French *
Richmond - French Defence: Tarrasch Variation
Schiller - French Winawer: Poisoned Pawn Variation
Schiller - Tarrasch French: Guimard Variation
Short - The French Defense *
Soltis - Beating the French Defense with the Advance Variation
Soltis - The Fighting French
Stone - French - 100 Examples from Recent Play 1981-1982
Suetin - French Defense
Sveshnikov - French Defence Advance Variation 1
Sveshnikov - French Defence Advance Variation 2
Tzermiadianos - How to Beat the French Defence: The Essential Guide to the Tarrasch
Uhlmann - Winning with the French *
Vitugov = The French Defense Reloaded
Wall - 500 French Miniatures
Watson - Dangerous Weapons: The French
Watson - Play the French, 1st edition
Watson - Play the French, 2nd edition
Watson - Play the French, 3rd edition
Watson - Play the French, 4th edition *
Williams - Attacking Chess: The French
Winters - The French Defense: Tarrasch Variation
Zeuthen/Jarinaes - French Poisoned Pawn