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![La clave secreta del universo (La clave secreta del universo 1) [George's Secret Key to the Universe]](https://m.media-amazon.com/images/I/81ryUw6iqyL.jpg)
Una maravillosa aventura por el cosmos [A Wonderful Adventure Through the Cosmos]
![El origen del universo (La clave secreta del universo 3) [George and the Big Bang]](https://m.media-amazon.com/images/I/81r46h27SLL.jpg)
Una nueva aventura por el cosmos [A New Adventure Through the Cosmos]
![El tesoro cósmico [The Cosmic Treasure]](https://m.media-amazon.com/images/I/81iUWWgL8KL.jpg)
Una nueva aventura por el cosmos (La clave secreta del universo 2) [A New Adventure Through the Cosmos (The Secret Key to Universe 2)
