Jim Carroll wrote earlier in this thread:
"Does anybody have any information about the D.K. Wilgus collection at U.C.L.A.?"
I have found where this is accessible via the SFC (Southern Folklore Collection) and have put a link at the bottom of the wikipedia article cited above. There are 8 cassettes of each around 1 hour's duration, which have been digitised and can be listened to on the web with a little effort (I had to allow the site to use Adobe Flash as a specific option). Not sure exactly what is on which tape at this time - I did not find a track-by-track contents list, though it may exist.
Regards - Tony