With so little material available, it's common for outtakes and assorted ephemera to be released to a ravenous horde of uncritical fans. These are interesting but non-essential releases. The Rykodisc release serves as the most exhaustive and authoritative document. Caveat Emptor:
Let There Be Burma is a re-release of
Mission of Burma (not to be confused with the Rykodisc release) and
Forget on one disc.
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John Dougan, Rovi