I think I'm safe to put this link here. You can find
1939 DON DIXON SUNDAYS here on this Google drive.
A long while ago, I posted a link to this directory for a strip that is NOT in the public domain and it had to be removed, because that's a no-no on this message board. But I'm guessing that DON DIXON is in the pubic domain and I'm safe to give the link here.
Figuring out the zoom on this site always trips me up. But if you're patient and fiddle around with it enough, you should be able to zoom and download the pages.
If they're good for what you need, you might want to consider replacing the Sundays on CB+ with these better ones. But I haven't gone through all the pages--so I'll leave that to you guys to sort out.