From the front cover:
This additional arcane spellbook contains all of the patron, origin, and tradition spells that warlocks, sorcerers, and wizards might discover.
From the back cover:
Contains 18 durable, laminated cards including: 16 for Warlocks, 1 for Sorcerers and 1 for Wizards. The perfect supplement to complete any arcane spellcaster's collection of spells.