https://www.plosin.com/milesahead/PluggedNickel.aspx
"At first the producers of the domestic project -- executive producer Michael Cuscuna, Bob Belden, and Steve Berkowitz and Kevin Gore from Columbia -- worked with masters provided by Sony Japan. The project was suspended, however, when archivists in Columbia's Manhattan storage facility came upon a cache of twenty-five 1/2" three-track "B reels," recorded on a second deck as backups for those times when the reels on the master deck were being changed. These new reels included more than twenty minutes of music that was missing from the supposedly complete Japanese set! All the tunes that were issued in edited form on the Sony Japan set could be restored to their full length. (For details on the restored passages, what was restored and where, see the notes to the December 22 and December 23 sessions elsewhere on this site.)"