From Diablo Wiki
There is one part to the Crumbling Journal and it's found on some skeletal remains in the Desolate Sands. The remains don't look obvious, they don't stand out any more than any other sets of bones but they are located in the same spot, on the east perimeter of the Sands as indicated in this Desolate Sands map.
Only one of your characters needs to find the journal for you to be credited with it.
To find out which journals you have found so far go to your Achievements list (press Y) and check:
- Campaign > Act II > Judge of Character
|Found on skeletal remains on the ground in the Desolate Sands (map).|
|Part||Text||Found on Quest|
|1||My mother told me not to join the mages' army. I should have listened. In the morning they're sending the infantry against the Vizjerei. I don't know how we're supposed to survive. Maybe we're not. It's so beautiful here. Maybe if I hid in the trees, they wouldn't notice me. -- Mage Clan Soldier||Blood and Sand|
| Books & Lore of the
|Tomes - Lore Books  In-game: People World/Quests Bestiary Diablo I & II Extra: Manuals/Other Novels History|
|Diablo I Tomes||Diablo II Tomes|
|Diablo I Manual||Diablo II Manual||D2: LoD Manual||Diablo III Manual||Other sources|
Abd al-Hazir (Writings)
|Diablo novels||The Sin War Trilogy||Diablo III novels||Diablo comics||Other books|