The Polar Bear Explorers' Club

A Sea of Shields (Book #10 in the Sorcerer's Ring)

Explorers at Stardust City

Percy Jackson and the Lightning Thief (Book 1)

The Ocean Squid Explorers' Club

The Ruins of Gorlan (Ranger's Apprentice Book 1 )

Explorers on Witch Mountain

Percy Jackson and the Sea of Monsters (Book 2)

The Hunt for the Cursed Unicorn

Percy Jackson and the Last Olympian (Book 5)

Explorers at Pirate Island

Percy Jackson and the Titan's Curse (Book 3)

Explorers on Black Ice Bridge

The Blood of Olympus (Heroes of Olympus Book 5)

Percy Jackson and the Battle of the Labyrinth (Book 4)