Crisis on Multiple Earths, Vol. 1

In this prequel to one of DC Comics' biggest hits, the first four team-ups between the Justice League of America and its Earth-Two counterpart, the Justice Society, are collected in this graphic novel, depicting their battles against cosmic, all-powerful menaces too big for either team to handle alone. Full color.
Includes material first published in Justice League of America #21, 22, 29, 30, 37, 38, 46 & 47