If they've been stored, not cracked or crinkled, they might be worth something. I've got newspaper pages from Sputnik, John Glenn, JFK, MLK, RFK, Apollo, Watergate... (starting to sound like Billy Joel here...
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Seriously, I suppose you'd have to call a ... I dunno?? Who buys and sells historical newspaper pages? You could try selling them on eBay, maybe..
Most of the ones I have are aged pretty badly - if I do anything with 'em, I suppose I'll just have 'em matted and framed.
Jetra, just read your post - if you have a real set of space-related front pages, I think a planetarium or museum might be interested. That would be a really cool display. (Maybe with scale models of the spacecraft involved!! Have the "Man On the Moon" front page with a big Saturn V model set up beside it.
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You might want to look into making facsimile copies and having them framed (as long as you don' t try to sell them it's not a copyright violation).