Crisis on multiple earths
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Graphic Novels - Science FictionFiction - GeneralJuvenile FictionGraphic NovelsChildren: Young Adult (Gr. 7-9)Fiction / GeneralComics & Graphic Novels - SuperheroesComic books, strips, etcJustice League of America (Fictitious characters)Comic books, stripsJustice Society of America (Fictitious characters)Life on other planets