Have you seen this site? It's got lots and lots of good info about the roots of the Carter Family repertoire.   "*Hello Stranger: Early 1900s- Traditional blues lyrics arranged by Carter Family. Carters-1937"
http://www.bluegrassmessengers.com/original-carter-family-songs--alphabetical-order.aspx

It's also an excellent site for bluegrass or bluegrass-related lyrics.