I bought the "Columbia River Collection" songbook, mostly to post this song - and then I forgot to. I'm glad Steven didn't forget. I did post a MIDI, so now our information on this song is complete. Thanks, Steven.
-Joe Offer-

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I also came across this website at the University of Oregon, which gives information about a video titled Roll On, Columbia: Woody Guthrie and the Bonneville Power Administration. It's available to individuals for $25.