Hey, I'm just getting into the game and shifting through the large number of supplements on the Paizo web store, and I am a bit overwhelmed. Is there a master list of which edition each supplement was designed for?
5th Edition Books:
The Broken Covenant of Calebais*
Guardians of the Forest: The Rhine Tribunal
Houses of Hermes: True Lineages
Realms of Power: The Divine
The Mysteries: Revised Edition
Covenants*
Houses of Hermes: Mystery Cults
Realms of Power: The Infernal
City & Guild
Ancient Magic
Houses of Hermes: Societates
The Lion and the Lily: The Normandy Tribunal
Art & Acadame
Realms of Power: Magic
Hedge Magic: Revised Edition
Realms of Power: Faerie
Tales of Mythic Europe
Magic of Hermes
Lords of Men
The Sundered Eagle: The Theban Tribunal
Rival Magic
The Church
Legends of Hermes
The Cradle & The Crescent
- Indicates a title shared with a book from another edition
4th Edition Books (according to Atlas' website):
The Wizard's Grimoire: Revised
Houses of Hermes
Mythic Europe
Faeries: Revised
Hedge Magic
Ordo Nobilis: Mythic Europe's Nobility
The Mysteries
The Medieval Bestiary
Living Lore
Faerie Stories
Kabbalah: Mythic Judaism
Ultima Thule: Mythic Scandinavia
Triamore: The Covenant at Lucien's Folly
A Medieval Tapestry: Personalities of Mythic Europe
The Mythic Seas
Mistridge
Mythic Places
More Mythic Places
The Medieval Handbook
Pax Dei
The Maleficium
Sanctuary of Ice: The Greater Alpine Tribunal
Land of Fire & Ice: Mythic Iceland
Blood and Sand: The Levant Tribunal
Heirs to Merlin: The Stonehenge Tribunal
The Dragon and the Bear: The Novgorod Tribunal
Tribunals of Hermes: Iberia
Tribunals of Hermes: Rome
Lion of the North: The Loch Leglean Tribunal
Cause & Cure
The Black Monks of Glastonbury
The Return of the Stormrider
Festival of the Damned
The Fallen Angel
The Bishop's Staff
this list is not correct, Atlas included all of the pre fourth edition books on the fourth edition page.
I've gone through the list you've provided
2nd ed.
Houses of Hermes
The Medieval Bestiary
Mythic Places
More Mythic Places
3rd ed.
Mythic Europe
Mistridge
The Medieval Handbook
Pax Dei
The Maleficium
Tribunals of Hermes: Iberia
Tribunals of Hermes: Rome
WoTC 3rd ed. (labeled 4th ed.)
Faeries: Revised
Lion of the North: The Loch Leglean Tribunal
4th ed.
The Wizard's Grimoire: Revised
Hedge Magic
Ordo Nobilis: Mythic Europe's Nobility
The Mysteries
Living Lore
Faerie Stories
Kabbalah: Mythic Judaism
Ultima Thule: Mythic Scandinavia
Triamore: The Covenant at Lucien's Folly
A Medieval Tapestry: Personalities of Mythic Europe
The Mythic Seas
Sanctuary of Ice: The Greater Alpine Tribunal
Land of Fire & Ice: Mythic Iceland
Blood and Sand: The Levant Tribunal
Heirs to Merlin: The Stonehenge Tribunal
The Dragon and the Bear: The Novgorod Tribunal
Cause & Cure
The Black Monks of Glastonbury
The Return of the Stormrider
Festival of the Damned (this was also released for second edition, the fourth edition book is the "anniversary edition" to commemorate the 10th anniversary of the game)
The Fallen Angel
The Bishop's Staff
I might be wrong, but I think Houses of Hermes is 4th ed. Order of Hermes (missing in the list) is 2nd...
Order of Hermes is indeed 2nd edition - it's one of the several books from 2nd edition (like Covenants or Festival of the damned) missing from the list above.
Houses of Hermes is one of the two books (together with Faeries Revised) that WotC produced for Ars Magica "3.5", i.e. at the end of the 3rd edition cycle but officially for a 4th edition yet to come. They have a different "feel" from both the angsty 3rd edition books of White Wolf, and the scholarly 4th edition books of Atlas.
Lion of the north is NOT one of these "3.5" books; it's instead solidly 3rd edition.
Whoops I wasn't reading carefully.