I was browsing thru the used cd bin at the record shop tonight and came across this little treat for only $6.99! With my $3 off coupon, that dropped it down to $3.99.
I had not heard of the New Mexico soundboard being released. Neither Argentum Astrum nor the Led Zeppelin Database list the May 23, 1973 Albuquerque New Mexico show as even having a tape, soundboard or audience. It's not on any of the Soundboard lists, either. I couldn't find any info on Discogs or Collector's Reviews or even by Googling the date, title and cd matrix number.
At first I thought it might be misdated or ev