In the link http://www.pbm.com/~lindahl/ballads/ One mention is of Bruce Olson's 'website', which is now hosted here at Mudcat. You can find it at 'quick links' at the top or at: https://mudcat.org/olson/viewpage.cfm
Many interesting and arcane items from his years of research. His Mudcat posts are still available with a search.
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