the UCLA Chicano Studies Research Center,
the Arhoolie Foundation,
and the UCLA Digital Library
Reel to reel master tape. This was never issued and assigned the prefix UN- as per Chris Strachwitz for cataloging purposes.
The first cut on the reel to reel un-13 is "Quedate Esa Vez". Not Sure on the female vocalist but they sound like Carmen Y Laura but that is just a guess. Very nice song.