I came across this document a while ago but it was severely outdated and missing many levels. I’ve updated it and uploaded it to google docs for anyone who wants it. It contains links so that all you have to do is find the level you’re looking for in the first column and click on it to open the level. Feel free to download it or just bookmark and use it. It contains just the CoCo levels, not Game Dev or Web Dev.
If anyone finds a level/levels that is/are missing, PLEASE LET ME KNOW so that I can update it.