A tough one. The better song books are expensive.
I want one by Ernst Busch, "Canciones de las Brigadas Internacionales," a booklet with 45rpm records (2) but is seems to be out of my price range.

American songbooks and records (Pete Seeger et al.) are all suspect; misinterpretation and alterations rife. But these are now rare as well. Except for a few old-timers and die-hard folkies, there is little interest in these songs.

I recommend downloading the songs and lyrics at the website 'Canciones' linked above in my post of 27 Jan 05 10:45 PM. A great archive.

Guthrie's "Jarama Valley"- based on Red River Valley- can be downloaded at this Spanish Memorial website: Republicanas

Fifteen other songs, most Spanish artists, at this site.