Board Thread:Questions and Answers/@comment-37169459-20181012061402/@comment-6369172-20181015115135

1/ Remember how old you were when you read it (if it was new at the time).

2/ Go to Appearances/Superman, and look for all issues of The Flash plus DC Comics Presents plus World's Finest plus Justice League of America, from that year (or those years) in which both appeared. Check those out individually.

3/ Go to Appearances/Flash, and look for all issues of Superman plus Action Comics plus DC Comics Presents plus World's Finest plus Justice League, from that year (or those years) in which both characters appeared. Check those out individually.

4/ If you remember other characters, or locations, or items, that were in the story, use them to further narrow your search.

Best I can think of, and it's a tedious-looking process, but it gives the best chance of eventually finding it. Stoop Davy Dave (talk) 11:51, October 15, 2018 (UTC)