Here's the list:
Core PC classes: barbarian (Bbn), bard (Brd), cleric (Clr), druid (Drd), fighter (Ftr), monk (Mnk), paladin (Pal), ranger (Rgr), rogue (Rog), sorcerer (Sor), wizard (Wiz)
Core NPC classes: adept (Adp), aristocrat (Ari), commoner (Com), expert (Exp), warrior (War)
Core prestige classes: arcane archer (Arc), assassin (Asn), blackguard (Blk), dwarven defender (Def), loremaster (Lor), shadowdancer (Shd)
Specialist wizards: abjurer (Abj), conjurer (Cjr), diviner (Div), enchanter (Enc), evoker (Evo), illusionist (ill), necromancer (Nec), transmuter (Tra)