Bundle includes:

Sir Cumference and All the Kings Tens
Sir Cumference and the Dragon of Pi
Sir Cumference and the First Round Table
Sir Cumference and the Fracton Faire
Sir Cumference and the Great Knight of Angleland
Sir Cumference and the Isle of Immeter
Sir Cumference and the Sword in the Cone
Sir Cumference and the Vikings Map
Pythagoras and the Ratios: A Math Adventure

Note: Some book covers may have changed.