BALMER, EDWIN and PHILIP WYLIE When worlds collide. Philadelphia and New York: J. B. Lippincott Company, 1933. Together with After worlds collide. Lippincott, 1934. Both later printings.Two works. Cloth boards (20 cm. tall), lettered in blue. With price-clipped jackets showing spotting and general shelf-wear; some chipping to jacket of the earlier work.