Barsoom, Vol. 31

by Edmond Hamilton, Norwel W. Page, Lester Dent, Paul Orban, William J. Makin, Robert E. Howard, John Coleman Burroughs, Clark Ashton Smith, Lin Carter, Rodolfo Martínez, Karl Edward Wagner, José Miguel Pallarés, Robert W. Chambers, Carlos Saiz Cidoncha, Leigh Brackett