D3’s lore books are broken into People, Quest, Bestiary, and World lore book categories, though they are discovered in areas/zones, not by those categories. You’ll see the one I’m missing below (“Battlefield Reports”), but I thought it would be more useful to make a full list instead of only asking for the one I need. Where are the Act 3 lore books, and when do they appear?
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Answer
This forum post includes details on how to find most but not all of the lore books for “Primary Sources”, “History of Arreat” and “Espionage”.
Primary Sources
Bloodstained Letter – The Keep (Needs confirmation)
Ghom’s Log – The Larder
Journal of Hansan Haile, Captain – Bastion’s Keep Stronghold, near Vidar
Leah’s Journal (13-16) – The Armory, below Leah
Morgan’s Journal (1-3) – Morgan’s Satchel, Skycrown Battlements/Stonefort
Espionage
Battlefield Reports – Battlefields (walk backwards from Bridge of Korsikk, fallen soldier has blue exclamation point above head)
Orders from Azmodan (1-6) – Messenger of Azmodan (Skycrown Battlements, Stonefort, The Keep, The Battlefields, Fields of Slaughter, Arreat Crater)
Historian of Arreat
Fall of the Barbarians (1-5) – Misplaced Packs, The Keep
The History of Bastion’s Keep – Librarian’s Scrolls, The Keep
For the beast lore, I believe it is fairly straightforward to obtain by killing all the new monsters in Act 3, but I will look for a good source. It is difficult to describe their locations since many are randomly generated.
Attribution
Source : Link , Question Author : Wolf , Answer Author : Community