How to mount paper to the backside of glass? Need advise on clear adhesive.

I would like to mount old maps to the bottom of a glass insert in a coffee table I'm redoing. How can I 'stick' the map to the underside of the glass so it's clear and the glue doesn't cloud the map or streak (even show for that matter)? Any good adhesive that's pretty much crystal clear? I already have matte and gloss mod podge that I could try but I only get one shot at this so any advice would be welcome, thanks in advance!!
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