I have Songs of the Lincoln Brigade on Stinson SLP #52. The record label gives the performers as Pete Seeger, Bess Lomax, Butch Hawes, and Woody Guthrie. The song Jarama Valley is definitely performed by Woody Guthrie and not Tom Glazer. I note that Smithsonian-Folkways record Songs of the Spanish Civil War, Vol. 1 released 1961 has Jarama Valley performed by Tom Glazer and Group. When you listen to the snippet it definitely is Tom Glazer and Group singing. Were two editions of this album released?