Here are the words and chords from the Johnny Cash Show Souvenir Picture and Song Book, Copyright 1966 Southwind Music, NY, NY. -- The souvenir album sold at JR's shows in those days. I just listened to him and then Roseanne sing it on YouTube. They both sang slightly different words, noteably "meadows" for "midlands". They both played it with 3 chords in G, no C#dim or Dm7.
- Phil

FORTY SHADES OF GREEN
(Johnny Cash)

I [C]close my eyes and picture the [F]emerald of the sea,
From the fishing boats at [C]Dingle to the [D7]shores of Duna[G7]dee.
I [C]miss the River Shannon and the [F] folks at Skipparee,
The moorlands and the [C]midlands [C#dim]with their [Dm7]forty [G7]shades of [C]green.
But [F]most of all I [G7]miss a girl in [C]Tipperary town,
And [F]most of all I [G7]miss her lips as [C]soft as eider[G7]down.
A[C]gain I want to see and do the [F]things we've done and seen,
Where the breeze is sweet as [C]Shalimar, [C#dim]and there's[Dm7]forty [G7]shades of [C]green.

I wish that I could spend an hour at Dublin's churning surf;
I'd love to watch the farmers drain the bogs and spade the turf;
To see again the thatching of straw the women glean.
I'd walk from Cork to Larne to see their forty shades of green.
But most of all I miss a girl in Tipperary town,
And most of all I miss her lips as soft as eiderdown.
Again I want to see and do the things we've done and seen,
Where the breeze is sweet as Shalimar, and there's forty shades of green.