I have a version of this excellent song on an old cassette by a group called Wickford Express: the tape is called Fair Winds and was published (in 1986) by Fair Winds Music, PO Box 196, Wickford, Rhode Island 02852, USA.

I notice that the entry for Silver Darlings is flagged "Courtesy Jon Campbell", so I presume he has some control over the copyright: not a name that I recognise, though.

The principal members of Wickford Express seem to be Dave and Cindy Peloquin, and Dan Cohen apparently plays fiddle on Silver Darlings.

Hope that gives you a few more leads.