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- George and the unbreakable code, Lucy & Stephen Hawking ; illustrated by Garry Parsons
- George and the big bang, Lucy & Stephen Hawking ; illustrated by Garry Parsons
- Hawking, Lucy, George's secret key (Series), bk. 1
- Hawking, Lucy, George's secret key (Series), bk. 2
- Hawking, Lucy, George's secret key (Series), bk. 3
- George and the ship of time, Lucy Hawking ; illustrated by Garry Parsons
- Hawking, Lucy, George's secret key (Series), bk. 5
- George's secret key to the universe, Lucy & Stephen Hawking with Christophe Galfard ; illustrated by Garry Parsons
- George and the blue moon, Lucy & Stephen Hawking ; illustrated by Garry Parsons
- George's cosmic treasure hunt, Lucy & Stephen Hawking ; illustrated by Garry Parsons
- Hawking, Lucy, George's secret key (Series), bk. 6
- Hawking, Lucy, George's secret key (Series), bk. 4