Hi, Wally - have you tried asking Dick Spottswood? He's still doing his show for WAMU, now on Sundays from 1-3. His radio station e-mail is dick@wamu.org.Since Bruce Molsky recorded it recently, maybe he has some info (although I bet he learned it from the Stonemans...) His website is here with an e-mail link.
Hope you and Berta are well!