Ah, shoot, my links got all messed up. Should be:

1: https://www.jstor.org/stable/pdf/30104293.pdf
2: http://www.fresnostate.edu/folklore/ballads/BrdExMiF.html
3: http://archiveswest.orbiscascade.org/ark:/80444/xv36282
4: https://m.facebook.com/InvinciblesReintermentCommittee/posts/343876932805450