Does anybody have National Geographic Map Supplement proofs from the 1980's for sale? If not for sale, could anybody post photos of what they looked like?
Is this what you're looking for?
The map proofs are earlier versions of the map supplements before the final revision and printing. It would be stamped proof on the maps themselves. I think they would be considered rough drafts. The map proofs would have information that sometimes would be deleted or rewritten.