Pathfinder RPG Pocket Edition - Rules of Play says:

This brilliant Pocket size edition of the Pathfinder Core Rules is a copy of the original in layout and format just in a more compact size, so you still get the wealth of information that would get in the big version but you may need some new reading glasses!

The Pathfinder RPG Pocket Edition includes:

• All player and Game Master rules in a single volume
• Complete rules for fantastic player races like elves, dwarves, gnomes, halflings, and half-orcs
• Exciting new options for character classes like fighters, wizards, rogues, clerics, and more
• Streamlined and updated rules for feats and skills that increase options for your hero
• A simple combat system with easy rules for grapples, bull rushes, and other special attacks
• Spellcaster options for magic domains, familiars, bonded items, specialty schools, and more
• Hundreds of revised, new, and updated spells and magical treasures
• Quick-generation guidelines for nonplayer characters
• Expanded rules for curses, diseases, and poisons
• A completely overhauled experience system with options for slow, medium, and fast advancement