1972-08-16 /decus_20tap2_198111/01/decus/20-0046/abacus.hlp 1972-08-16 /decuslib20-02/01/decus/20-0046/abacus.hlp 1972-08-17 /decuslib10-02/01/43,50241/abacus.hlp 1974-04-09 /decus_20tap2_198111/01/decus/20-0076/abacus.hlp 1974-04-09 /decuslib20-02/01/decus/20-0076/abacus.hlp 1974-04-10 /decuslib10-04/01/43,50326/abacus.hlp