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I've never tried it, but this link has some ideas:
https://www.diyphotography.net/save-old-photos-stuck-together/
Freezer?
https://www.thriftyfun.com/tf522321.tip.html
https://www.hunker.com/12000864/how-to-separate-stuck-photos
A blow dryer will help to warm the adhesive and loosen it.
Here is a great tutorial for unsticking photos https://www.diyphotography.net/save-old-photos-stuck-together/