There are two examples in the DT, under the most common title:

THE JAM ON GERRY'S ROCKS As published by an unspecified Lomax, with alterations by somebody and two verses added from a book identified only by its title. Traditional sources not named.

THE JAM ON GERRY'S ROCK As recorded by Pete Seeger; traditional source not named.

See also DEATH OF HARRY BRADFORD, a song based on it.

I expect there are discussions in the Forum, too, but unfortunately the search engine isn't working just at present.