Thank you both for your replies! I had a feeling that it was not possible and had the same conclusion as Jerry, i.e., scroll through the master source list and make a note of who has that source type, but I had to ask anyway.
As for the SQLite thing, I'm not up for tearing my hair out today and I'll just make notes of who/what. Good idea, though, that if one were to want to try it to make a copy of database first.
Nikki