I'm writing a blog post about these proposed-but-never-signposted routes, and would like to illustrate how they were prematurely and erroneously marked on some maps during the mid-1930s. But I don't have one myself, do you? Otherwise, if you can point me to an online map. So far the only ones I've found are Indiana DOT 1935 and '36, which show a short segment of US 37 in Kentucky south of Louisville. Thanks.
Found a recent thread with a map of both in the replies, not sure if that’s what you’re looking for
https://www.aaroads.com/forum/index.php?topic=24400.0
As mentioned in the thread SkyPesos quoted, Gousha maps from that era had US 37 marked. I had at least one, but have no idea where it might be.
I have never seen an image of one that was posted in the field. Now that would be something.