Lore

Lore is a skill that, combining with Intelligence, allows the character to identify valuable items that would otherwise show up as "Unknown."

Mechanic
Bards and Bohemians - characters with the Atheistic axiom and the Rogue class - are automatically given the Lore skill during Character Creation.

Skill books

 * Elementary (Book II and Book III)

Trainers

 * Leisle (Book III)