i know someone once on these board wanted to preserve the original theatrical german dubs since they are not on any of the dvds.
i believe star wars (now called episode IV) got spainish, french and german as well as japan dubs all done in monaural .
well actually the spanish one was more of a narration than a dub as i recall, it is a very rare laserdisc release.
as far as i know a couple of the prequels got official mandarin dubs on vcd not sure which ones though.