Blowin' in the Wind - chords, tab and comments

This song is an incarnation of the early sixties, and a monumental bridge between the american folk music and flower power, but I hardly ever play it anymore. Maybe with my 6th can of beer sometimes, for nostalgical reasons. It's simply worn out :-) It's chords-friendly, though. You can add a lot of harmonies, and it remains the same song. But I stick to the original here, only fiddling a bit with my thumb.
G          C           G                            C          D7
how many roads must a man walk down before you can call him a man ?
G                  C           G                           C           D7
yes and how many seas must a white dove sail before she sleeps in the sand ?
G                  C              G                               C       D7
yes and how many times must the cannon balls fly before they're forever banned ?
      C         D7        G             G7
the answer my friend is blowin' in the wind
      C         D7            G
the answer is blowin' in the wind
G major
C major
D 7th
G 7th
Bob Dylan