The ISBN of George's Cosmic Treasure Hunt is 9781416986713.
The ISBN of Cosmic Jackpot is 9780618592265.
The ISBN of The Cosmic Serpent is 2825704954.
The ISBN of Cosmic Odyssey - comics - is 1563890518.
The ISBN of Treehorn's Treasure is 0823404250.
The ISBN of The Treasure of El Patron is 0440410487.
The ISBN of The Treasure of Alpheus Winterborn is 0152899367.
The ISBN of Treasure of Khan is 0-399-15369-1.
The ISBN of Treasure Box is 0-060-17654-7.
The ISBN of The Tower Treasure is 0-448-08901-7.
The ISBN of The Big Honey Hunt is 0394800281.
The ISBN of Child of the Hunt is 0-671-02135-4.
The ISBN of The Hallowed Hunt is 0-06-057462-3.