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Preserving old paper documents is the same from tank stickers to family history documents. Here is a good link that I have used for some irreplaceable items.
I put mine in a picture frame with UV glass and acid free paper. I don't hang it up, its that way in my filing cabinet. This is stored in my office so it doesn't see the moisture or temp changes that it would in the basement.
Not sure that this is the best way, but it keeps it flat and the elements shouldn't degrade it.