I got frustrated when I realized near the end of the game that I didn't have all of the books of a set and I had to search the hole dungeon looking for it, so here they are:

A Brief History of Orcish Culture (party +1 Impact)
Book self located in the basement south west side of gambling den.
1/2 - 1st floor - Room north of the vendor. Looks like a dorm room.
2/2 - Basement - Room behind the bar in the gambling den.

Anthopological Function of the Goblin (party +2 Dodge)
Book self located on the 4th floor in Reivax's room.
1/3 - 2nd floor - Hallway west of V.I.P. room.
2/3 - 4th floor - Room south east of the guard room.
3/3 - 4th floor - Room attached to elevator.

The Barbarians (Barbarian +2 Str.)
Book self is located in the Co-op room on the 2nd floor.
1/3 - 2nd floor - Dorm.
2/3 - 2nd foor - Locked room north of the dorm.
3/3 - 2nd floor - Privy.

Basic Spells for Basic Wizards (Wizard +2 Int.)
Book self is located on the 2nd floor in the room locked by an ogre door.
1/4 - 1st floor - South side of the Ritual room.
2/4 - 2nd floor - Room north of the Basin Room.
3/4 - 5th floor- Privy.
4/4 - Library - Cursed Book Room.
Cursed Knights for Dummies (Party +2 Physical Resist)
Bookcase is located in the library in the room south of Khazline's office.
1/3 - Library - Room north of front desk.
2/3 - Library - Duesdays' office.
3/3 - -Library - Room south east of the Index.

Demonology : Randomai (fills randomai meter)
Bookshelf located in basement behind a locked door in the wine cellar.
1/4 - 4th floor - Reivex's room. On the terrace.
2/4 - Library - South of Duesday's Office - encounter drop.
3/4 - Basement(last chapter) - In a locked room near its bookshelf.
4/4 - 4th floor - Prison room - encounter drop.

Demonology : Tuff'luk God of Fail (Party +1 Precision)
Book self is located in the basement in the locked room next to the wine cellar
1/4 - 4th floor - Raivax's Office.
2/4 - Basement - Wine Cellar encounter drop.
3/4 - Library - Training Room encounter.
4/4 - Subbasement - Encounter drop just after leaveing Urik's Depths.

Dwarven Strikes and Social Movements (Dorf +2 Con.)
Book self is in Urik's Depts in the Queens Chamber. Do the chase the lever quest to open.
1/5 - Room West of the Palace.
2/5 - Dorm east of the Tavern
3/5 - Encounter drop. Axe quest.
4/5 - Room north east of the Throne Room.
5/5 - Prison - In the far right prison cell when facing the row of cells.

History of Elves in Fangh (Elf +2 Agi.)
Book self on the 6th floor in herbalist area.
1/3 - 2nd floor - North of the Cauldron Room.
2/3 - 6th floor - In a chest in the Garden
3/3 - 7th floor - Chicken Coop.

On Adventure (Ranger +2 Char.)(better than a swift kick in the a** I guess)
Book shelf is on the 6th floor in the executioners room
1/3 - 1st floor - Room behind the privy.
2/3 - 6th floor - Room north of the Forge.
3/3 - 7th floor - On a blimp.

Secrets of Chicken (Party +1 Sprint)
Book shelf is on the 7th floor
1/4 - 1st floor - Vendor room.
2/4 - 2nd floor - Co-Op room.
3/4 - Library - Chase the lever quest.
4/4 - 4th floor- Goblin Workshops.

The Theory of Traps (Thief +2 Courage)
Book shelf is in the Subbasement in the stalker area.
1/4 - 2nd floor - Dark Dorf encounter.
2/4 - Basement - Room west of Stalkers Den.
3/4 - Basement - Encounter drop Minstrel quest.
4/4 - Library - Rare Book Room.

What of Golbarghs (Party +2 Magic Resist)
Book shelf is on the 5th floor in the room to the east of the privy.
1/2 - 5th floor - Lair of the Golbargh. In a chest behind the thrown.
2/2 - 5th floor - Puzzle room that opens after you return from the library.

POSTERS:
1 - 1st floor - Room south of Gardens. Looks like a dorm.
2 - 2nd floor Dormitory western wall.
3 - 6th floor small shops area on the north wall of the tailor shop.
4 - 2nd floor Mel's room
5 - 7th floor - In the attic on the north wall nest to a statue. There are 4 statues and it is on the
left of the second statue from the left.