A recent article on CityLabs commemorated November 11, 1926 – the day when all the old national road trails were first renumbered as the U.S. National Highways System that survives pretty much intact to this day. The article also featured this great map that was produced at the time, and a link to a very high-resolution scan of it over on the Wikimedia Commons.
Being a subject close to my heart (as this highway system is the basis of not one, but two of my “subway map” projects), I downloaded the map and began perusing it eagerly; seeing where the system had changed and where it remained the same. As I looked, I began to see that while the quality of the scan was good, and the content of the map was fascinating, the map itself was in a pretty sorry state. Basically, it looks like you’d expect an 88-year old map to look — dirty spots, fold and crease marks, ink that had rubbed off on other parts of the map when the map had been folded, and so on.