A new compilation of Victor Jara's songs, 'Manifesto', was released in the UK last year on Castle Communications (ESMCD 657). I don't know whether it was also released in the US, but it was relatively cheap in the UK so it probably wouldn't cost too much to import.
I believe the material on this cd was originally issued in 1974 on Transatlantic XTRA 1143. It includes transcriptions of the lyrics to all the songs, some in both Spanish and English.
The biography written by his wife, Joan, is called 'Victor' and was originally published in 1983 by Jonathon Cape.
Victor Jara was playing at the University of Santiago on 12 September 1973 (the day after the murderous, undemocratic, CIA sponsored, coup). The military took over the university, 'arresting' both students and professors. They took them all to a boxing stadium, where Jara apparently kept morale up by playing and singing until the military smashed his hands and then, after two days, killed him with machine guns.