This lot includes all four books of Harry Turtledove's Worldwar series. The story is a work of fiction that takes place during World War II, but with an alien race invading Earth. The books are vintage paperbacks from Del Rey and were published in 1995. The author is Harry Turtledove, who is known for his science fiction and fantasy novels. The books are in English language and are available for sale in the United States. The genre of the books is both science fiction and fantasy, and they are categorized under "Books" and "Books & Magazines."