This lot includes three vintage science fiction novels by Robert A. Heinlein. The books are in paperback format and were published by Signet. They are perfect for young adults and adults alike who enjoy fiction set in the future. The titles included in this lot are "Revolt in 2100" and two other novels. The books are in good condition for their age, with some wear and tear on the covers and spine. The pages are yellowed due to age. Shipping is available to the United States. Thank you for considering this lot of vintage science fiction books!