This is the guy I was thinking about when I posted as GUEST above:

https://en.wikipedia.org/wiki/Aloys_Fleischmann

That 2-volume book is ridiculously expensive, half the size of Bronson and several times the price. It would be great if CAMSCO would reprint it.

When I was researching this stuff, the most useful tool I had was Charles Gore's "Scottish Fiddle Music Index", which includes theme codes so you can see when the same tune has been given different names over the years. A similar index, covering English music as well but with a slightly smaller time scope, is the "National Tune Index" microfiche set. Its theme code system is different but they both work.