I think the Kingston Trio did this, as well. If they did, and if their version is not the one on the DT, try their website, very good for lyrics to their songs. (Sorry haven't got the URL handy, didn't bookmark it).
RtS (there was a thread on this last year,started by me, querying the attribution to Blind Blake: turned out it was the other Blind Blake- WI Calypsonian, not the ragtime guitarist/blues singer)