Maybe LePages or some other Mucilage. Plant based, so probably water soluble, although some glues like that aren't soluble after they dry.
If the stock isn't coated on either side, I wouldn't expect to remove it all without damage.
It might be worth running them past a paper conservator. They'd have the experience to know how much can be removed and it may not be all that expensive.
To me this also brings up some interesting questions.
Were they originally ever issued not glued together?
I could see saying that glue removal and re-gluing with an archival type glue would be best, and return them to a restored state closer to "as issued" Most modern archival stuff is easily reversible.
Or.... buy some mucilage if it can be sourced, and reglue as original?
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