It used to be published Bi-monthly . The book was written by Bill Mantlo . Countdown to Final Crisis is of superhero,alternate history,supernatural genre . This book was published in (vol. 1) June 1952 – February 1966 . Vertigo published ,The book named Countdown to Final Crisis . Karate Kid,Duela Dent,Superman-Prime,Pied Piper,Ray Palmer,Holly Robinson,Harley Quinn,Trickster,Kyle Rayner,Donna Troy,Mary Marvel,Forager,Triplicate Girl,Monarch,Jason Todd,Jimmy Olsenare the main characters of the book . It is a mini-series . The no. of issues of the book is 101
Countdown to Final Crisis was published before 1950