Well, there's Empty Pocket Blues by Clive Palmer and Teapot Blues by Wizz Jones. Both adapted a tune by Brian Kennedy with whom they were sharing a house in about 1960. I think there are still ongoing arguments about who nicked what from whom.    The point is that both (rather similar) songs were based on a neat C-A flat progression.

I haven't heard a Pete Seeger version so I have no idea if either (or both) of these was his source. A recording of the Clive Palmer's Empty Pocket Blues appeared on the first Incredible String Band album in 1966 but Wizz's Teapot Blues had to await the extended re-release of his album with Pete Stanley, 16 Tons of Bluegrass, a couple of years ago because much earlier plans for its release as a single were abandoned by the record company.