Crisis on Multiple Earths #1

Gardner F. Fox with Mike Sekowsky (Illustrator)

Crisis on Multiple Earths #2

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