Born in 1916 in the heart of the Appalachians, Ola Belle made music with family and friends from her childhood until a stroke at the age of 70 rendered her incapable. She was not "discovered" by them fancy folklorist types until the mid-1960s, which is when these recordings date from.
Both tracks come from an excellent compilation called "Ola Belle Reed and Southern Mountain Music on the Mason-Dixon Line" released by Dust-to-Digital. The first CD features the best of Ola Belle's 1960s recordings, and the second features her descendants and friends recorded forty years later. You can also buy a version with a book about Ola Belle and the gang, but I've not read it so can't vouch for whether it is worth the extra money.
"I've Endured" - Ola Belle Reed
Apparently this lot were named after her. Or so I'm claiming.