Download or read book Justice League of America (1960-) #56 written by Gardner Fox and published by DC Comics. This book was released on 1967-09-06 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The JLA and JSA team up to stop the black matter villains on Earth-2, using artificial means to power up four of their own with black matter. But the gambit has unexpected and dangerous consequences!