Hello Joe, welcome to Stamp Community!
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would soaking and drying with some books to press them help this stuff?
Yes, I agrre with littleriverphil. I use Desert Magic books myself, but you sometimes I use just plain typewriter paper folded in half, put the stamps from paper towels in the middle and then inside an old phone book and another on top.
The new stamps, peel and stick or self-adhesive type, on some kind of poly-paper or something (not sure, depends on printers from different countries) can also use the mineral spirits method as talked about on SCF here before and a video on U-tube, using a metal ruler I think. Haven't used it myself yet, too busy accumulating.
I am still up in the air about them myself, as KGV_Collector in Australia, with some hard to remove Australia stamps there, has figued out a method to just soak them, but his water may be diffferent maybe.
I have some France stamps that are difficult to get off and with thinner paper too, but I have seen them on
ebay and elsewhere soaked off so am still investigating. Some coming I the mail soon too.
Some people have suggested using salt in the water helps too.
I dod want to collect the flag series US soon also myself.