The version I heard, as recorded by the Coon Hunters - a group that included Merle Travis in his first recordings started with the first verse mentioned above, then followed with :

Come to the window,
My love, do,
Listen to the music I'm playin for you,
Whisper a love song, soft and low,
Harmonize the music on my old banjo.

Softly the casement begins to rise,
Stars am a-twinklin, up in the skies.
The moon is declinin' way behind the hill,
Reflectin it's light upon you, my Nancy Till.

Farewell, my true love, I must away,
Got a long way to travel before the break of day,
The next time I see you, be ready for to go,
Sail away together on the Ohio.

The Coon Hunters recordings are available on a cd from the British Archives of Country Music (B.A.C.M.). Camsco Music can get it here in the states.