Lettering could also be by Joe Kubert.
Story across 23 pages, but pages 6 and 23 are 2/3-pages and page 14 is a 1/2-page.
With the JSA, story continues in #74. First appearance of Golden Age Superman of Earth-2.
Letters submitted by Frank Rizzo; Leon Dornbaum; Steve Grabinsky; Dave Truesdale.