This lot includes two paperback novels by Ben Bova: "Mars" (1992) and "Mars Life" (2008). Both books are part of "The Grand Tour Series" and fall under the genre of science fiction with elements of action and adventure. "Mars" is 564 pages long and weighs 7.8 ounces, while "Mars Life" is also 451 pages long and weighs 7.8 ounces. These novels are in great shape and offer an exciting and immersive reading experience for fans of science fiction and adventure stories.