Put it in a glass of water for a couple of days.
Since you sound new to this, DO NOT rub on the front of the card where paper is missing. You'll end up removing more of the surface paper.
The advice above seems sound. I suggest a two day soak, a rinse, and then blot dry it a few times, then put it between some paper and books (you don't want it pressed flat, you do want it to dry flat).
Patience. You can always soak it again. Gentle, you can't go putting paper and ink back on it.
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