The chords to the verse, on the Maria Muldaur recording, at least, are a half step lower than the ones at the link, but the bridge chords are the the same. It gives it a nice sounding half step key change and effectively shakes off all the people who are trying to play along by ear, even if they made it through the Gb section:-)

Verse

Eb / Ab Db9 / Eb / Ab Db9 /
Eb / Ab Db9 / Gb Cb9 / F6 Bb11 / and repeat

Chorus

Chorus:
F G9 / C11 D11 / F G9 / C11 D11
F G9 / C11 D11 / A11 B11 / back to verse