Forgive me if this has already been covered, but I doubt there's a wholesale way to eliminate the entire back from all of the cards all at once without a host of problems, so the first step for me would be to methodically use a pair of sharp scissors and an X-Acto knife to slowly cut away each card (with cardboard backing still attached) from the whole. It looks like the edges of the cards that overlap could be lifted slightly to allow a slicing underneath. Once all of the cards become individuals pieces, you will find the next step of soaking and whatnot much more easy to accomplish.
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