Forty shades of green. Harmonica Tabs

This is credited to Johnny Cash (words and music)but could this be a
traditional Irish number? does anyone know?

6 6 5 5 -4 5 5 7 7 -6 -6 6
I /close my eyes and/pic-ture the em-rald of the/

-6 7 7 7 7 -7 7 -6 6 6 6
sea from the/fish-ing boats at/Din-gle to the/

-6 -4 -4 5 -4 6 6 5 5 -4
shores of Dun-a-/dee I/miss the riv-er/

5 5 7 7 7 -6 -6 6 -6 7
Shan-non and the/folks at Skip-pa/ree the/

7 7 -7 7 -6 6 5 5
moor lands and the/mea-dows with their/

-5 -5 5 -4 4 7
for-ty shades of/green but/

7 7 7 7 -7 -7 -6 6 6 7 6 -5
most of all I/ miss a girl in/Tip-per-ar-y/

5 7 7 7 7 7 -7 -7 -6 6
town and/most of all I/miss her lips as/

6 7 6 5 -4 6 6 5 5 -4
soft as ei-der-/down a-/gain I want to/

5 -4 5~~ 7 7 -5 -6 6 -6~~ 7
see and do- the/things we’ve done and seen/-where

7 7 7 -7 7 -6 -6 6 5 -5
the/breeze is sweet as/Shal-i-mar and there’s/

-5 -5 5 -4 4
for-ty shades of/green / to verse 2

v2.
7 6 5 5 -4 5 5 5 7
I wish that I could/spend an hour at/

7 -6 -6 6 -6 7
Dub-lin’s churn-ing/surf I’d/

7 7 -7 7 -6 6 6 6
love to watch the/farm-ers drain the/

-6 -4 -4 5 -4 6 6 5 5 -4
bogs and spade the/turf to/see a-gain the/

5 5 7 7 7 -6 -6 6 -6 7
thatch-ing of the/straw the wo-men/glean I’d/

7 7 -7 7 -6 6 5 5
walk from Cork to/Lairn to see the/

-5 -5 5 -4 4 (To “but/most of all I” etc)
for-ty shades of/green /