This is a rare and exquisite edition of two classic science fiction novels, At The Earth's Core and A Princess of Mars, both written by E.R. Burroughs. The books are beautifully bound in leather and feature stunning illustrations. Published by Easton Press in the United States, this edition is a must-have for any collector of antiquarian and collectible books. The language used in both novels is English, making it accessible to a wide audience. In addition, the books have special attributes that make them stand out from other editions.