1970 US 1st Rico Records Stereo label variation edition. Released in both Stereo and Mono with identical center record label variations, identical vinyl weight, WITHOUT any Channel indicators, and ALMOST similar matrices . The only way to distinguish which version is Stereo or Mono, is by the order in which the information is etched within Side A matrices: Mono: RICO LP 708 A RAY ◁3. Track B3/ Soy Boricua is a Bomba. Track B4/ Delia is a Ballad sung in English.