I also could not find my map pictures... but there used to be a chart on the internet that showed them all. So here is a screen grab of the SH4 Mission Editor with a couple of "name" files loaded:
TMO, TMOwTw, FOTRS and FotRSU has them, but all have them because TMO had them first.
Here is a cover of a pdf file I have, which is the closest I got to finding a chart online, and it is part of an article - but really good reading. I just searched on it to link you to it, but it is no longer a research paper, but rather an onliine "book"... hmmm