Lane, I just looked in the book, "Woody Guthrie Folk Songs." At the heading of 900 Miles, pp. 30-31, it says "Additional lyrics by Woody Guthrie. Based on a traditional song."
This is a clear statement that the song is traditional.

Ludlow Music, 1963, "Woody Guthrie Folk Songs," 264 pp., NY, Intro. by Pete Seeger.

Guthrie's new lyrics are the 'pawn' verses, part of them in the DT. I will post the complete Guthrie lyrics in thread 42164 a little later today.
There are more and better lyrics in the trad. versions, so it is easy to stay away from Guthrie's copyrighted (1958) material. Or add some of your own.
Nine Hundred