Joel, from an informative review on amazon.com by Jean-Marie Juif:
But to complete this CD, we now can listen to 35 more minutes of unissued music by Bird.Tracks 9 to 14 come from other concerts in Washington: tracks 9 to 12 were recorded at the Howard Theater on March 8,1953, with a trio composed of Jack Holliday,Franklin Skeete and Max Roach, while tracks 13 and 14 were taped at the same place,October 18,1952,with among others,Don Lamond,Zoot Sims,Charlie Byrd,Kay Winding and Earl Swope.Bird's playing is absolutely crazy on the March 1953 date.