Vintage collection of Edgar Rice Burroughs' Barsoom series, published by Ballantine Books in the 1970s. This set includes nine mass market paperbacks featuring iconic fantasy cover art. The collection spans several titles in the Martian series, including The Gods of Mars, Warlord of Mars, Thuvia Maid of Mars, The Chessmen of Mars, The Master Mind of Mars, Swords of Mars, Synthetic Men of Mars, Llana of Gathol, and John Carter of Mars. Perfect for collectors of classic science fiction and pulp adventure literature. Books show typical shelf wear and aging consistent with vintage paperbacks, including some price stickers on covers and minor spine creasing.