No, sorry, but even if it was transcribed correctly, the singer may have sung a version that was inherently wrong. If there is no other version which has these words and if common usage says that the phrase 'oil of green' did not exist then and does not exist now, then I believe Mrs Delie Knuckles of Barbourville, Ky. on May 16, 1917 sang a version that she believed right but, unfortunately, was not. compounding an error is not unheard of but to knowingly perpetuate that error is, in my opinion, a little silly.

Just my 2p. worth

DtG