For those not on RTSR, this morning I linked this recording I found some 9 months ago there.
[Mod note:
http://www.borndirty.org/forums/showthread.php?t=9128]
It's an hour an a half, and seems like a legit recording. I have no info about it's source or anything as I found it googling around for 'experimental sound field 1992'
Enjoy
edit: my bad mods! won't happen again. There's an RTSR thread with the link.