Lovely song - I play this in G (capoed up a few)
G Bm C Am am7
C D7 G (Em)-optional
C Am D7
(repeat)
Chorus:
G +d G C Am
C D7 G Em Bm C Am

a nice addition is to play CM7 and Am7 instead of C and Am - quite easy but adds a nice plaintive sound

Sounds like the music is available in the mary black songbook ( as stated above)