Here's the Paxton version - he wrote it.

...Tiger

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THE LAST THING ON MY MIND
(Tom Paxton)

It's a lesson too late for the learnin',
Made of sand, made of sand.
In the wink of an eye my soul is turnin',
In your hand, in your hand.

CHORUS
Are you going away with no word of farewell?
Will there be not a trace left behind?
Well, I could have loved you better,
Didn't mean to be unkind,
You know that was the last thing on my mind.

As we walk on, my thoughts keep tumblin',
'Round and 'round, 'round and 'round.
Underneath our feet the subway's rumblin',
Underground, underground.

CHORUS

As I lie in my bed in the mornin',
Without you, without you.
Every song in my breast lies a-bornin',
Without you, without you.

CHORUS

You've got reasons aplenty for goin',
This I know, this I know.
For the weeds have been steadily growin',
Please don't go, please don't go.

CHORUS

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Note from Joe Offer: this is more-or-less the version in the Digital Tradition. It is quite different from the Tom Paxton recording.
-Joe Offer, 30 Jan 2011-