There are multiple threads on the forum for this (and we have the search function back again) but here you go:
(Area/X Pos/Y Pos)
Book of Constitution
3601
729
334
In hole in cave
Book of Strength
2615
349
894
Candlekeep catacombs
Book of Dexterity
0153
1245
540
In barrel
Book of Intelligence
0138
378
251
On bookshelf
Book of Charisma
5102
252
167
In chest in cave
Book of Wisdom (First two in BG, third in TotSC)
0132
257
239
Carried by Chanthalus Ulbright
2615
3142
2121
Candlekeep catacombs
TotSC
0504
1361
120
On Alter
Adapted from
PlanetBaldur'sGate