Crisis on Multiple Earths #1

Gardner F. Fox with Mike Sekowsky (Illustrator)

Crisis on Multiple Earths #2

Mike Friedrich with Cary Bates, Frank McLaughlin, Dick Dillin, Richard J. Buckler, Len Wein, Neal Adams, Dick Giordano, Gaspar Saladino, Tatjana Wood, Jack Abel, Sean T. Collins, Nick Cardy, Glynis Wein, Carl Gafford, Joe Giella, Ernie Chan, Anthony Tollin, Elliot S! Maggin