Call for resource material!

[Matthew Allen Newsome <mnewsome@warren-wilson.edu>]

Greetings all.  In preparation for a class I will be teaching at the 
Jongluerie and Bardic Collegium in March on Medieval Scottish Ballads, I 
am trying to put together a list of as many sources for these songs as I 
can, to help students in the class with further research.  Has anyone out 
there found any books they find especially useful in this area, outside 
of the Child collection?
Aye,
Eogan