I'm really sorry for not posting those. I used the progression of
C---Am-------F----G7----C. Here's a try:


---C--------------------------------F---------------C
Way down upon the Wabash, such a land was never known,
-----F-----------------------------G7---------------C
If Adam had crossed over it this soil he'd surely owned,
-------F--------------------------G7--------------C
He'd say it was the garden he'd lived in when a boy,
--------C-----------------------------------F--------C
And straightway pronounce it Eden -- in the state of Illinois.

Chorus:
-----C-------------------F
So move your family westward,
-------C----------------Am
Good health you will enjoy,
------C
And cross the Shawnee Ferry,
--------F-------------C
To the state of Illinois.


(That's my favorite of the chorus choices.)

THAT SAID, I always used the chord progression stated above (C-Am-F-G7) with it's implied bass runs as needed to enhance the tune a bit within those chords. I also used a similar fingerpicked and strummed backup progression on Don Lange's great song called "Here's To You Rounders---on that same album.

I hope this works for you. If you have any questions, just put 'em below...

Art