1981-04-21 /BB-J939B-BM/01/documents/six12.hlp 1982-03-03 /BB-J941C-BB_A19/01/six12.hlp 1982-03-03 /BB-J941C-BB_A19/03/six12.hlp 1984-02-07 /BB-J941D-BB/01/six12.hlp 1984-02-07 /BB-J941D-BB/03/six12.hlp 1984-02-16 /BB-J939D-BM/01/documents/six12.hlp 1984-11-15 /BB-J939E-BM/01/documents/six12.hlp 1989-08-02 /bb-j939f-bm/01/documentation/six12.hlp 1989-08-25 /bls36v42/01/six12.hlp