Crisis between Earth-One and Earth-TwoJ
(JLA 46, August 1966 - here seen as Mighty 57  from the collection of Mark Cannon) &
The Bridge Between Earths
(JLA 47, September 1966 - here as first seen in Australia in Mighty 58 - from my collection, original covers below.)
Facing a triple threat the members of the JLA & JSA are transported to fight two old foes as well as a being from the anti-matter universe who is causing the two planets to coincide and destruct.  The combines forces of the two teams overcome their enemies and then defeat the Anti-matterman and hold the earths in their individual positions.

Roll Call

The Atom, Batman, The Flash, Green Lantern & Hawkman

Dr Fate, Dr Mid-Nite, Black Canary, Wildcat, The Spectre and the first silverage appearance of The Sandman - back in his old suit and gas-mask.
Battle
Anti-Matter Man, Solomon Grundy, Blockbuster
and four gangs of thieves

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