Recently I did a lot of searching of DigiTrad and old threads, and I found these songs which, although they they weren't the songs I was looking for, nevertheless appear to have been missed and not added to DigiTrad.

Across The Hills Of Home (Jimmy's Song) by Eric Bogle & James McArthur.
Brown Mountain Light by Scott Weisman.
Dingle Bay by Brian Warfield.
If I Had A Boat by Lyle Lovett.
Jealous Hearted Me by the Carter Family.
Killing The Blues by Roly Salley.
My Black Mama, Preachin' The Blues, Dry Spell Blues
Ole Slew-Foot Recorded by Johnny Horton, Words and music by Jay Webb.
Paddy's Dream from Howe's Songs of Ireland.
Patrick Street
Sailor's Consolation as sung by Gordon Bok.
Texas Easy Street Blues^^
Who Will Watch the Home Place^^ by Kate Long.
Will Ray Worried Blues, as recorded by Bob Dylan,
Worried Blues^^ by Frank Hutchison, Bill Hunt.