Justice League of America Vol.1 #75
Black Canary joins the JLA after traveling to Earth 1 from Earth 2; The JLA must battle evil versions of themselves, and Black Canary discovers she's gained the power of a sonic scream as a result of crossing over to Earth-1.
First Printing: Nov 1969
Writers: Denny O'Neil
Art: Dick Dillin and Joe Giella
Cover: Carmine Infantino and Murphy Anderson