I notice you’re looking for — this likely refers to the 3-CD set Woodstock: 40 Years On: Back to Yasgur’s Farm (often shortened to Woodstock 38 by collectors, referencing the 38th anniversary in 2007).
To date, no official release has matched the scope of the "38 CD" bootleg. Official releases like Woodstock: Three Days of Peace and Music (4 CDs) or Woodstock 40 Years On: Back to Yasgur's Farm (6 CDs) only scratch the surface. The 38 CD download represents the entire audio archive. woodstock 38 cd download