This lot includes 5 vintage, unread science fiction novels by Robert A. Heinlein. The books are in paperback format and are revised editions published in 1954 by Signet. The intended audience is adults and the original language is English. The narrative type is fiction and the genre is science fiction. The books are categorized under "Books & Magazines" and "Books". The author's name is Robert A. Heinlein and the publisher is Signet. The books are located in the United States and are perfect for collectors or fans of classic science fiction.