In team comic books, you never know when a "first" is going to occur, and that's true of the Justice League of America. Issue #19 isn't that big a deal in the overall breadth of books about this team, except for one item. This is the book where they all tell each other their secret identities! This is basically the turning point for the team as they now feel they have trust in each other.
Writers - Gardner Fox
Pencilers - Mike Sekowsky
Inkers - Bernard Sachs
Editors - Julius Schwartz