1981-07-20 /BB-H580C-SB_1981/01/cobol.utd 1983-09-01 /BB-H506D-SM_1983/01/cobol/documentation/cobol.utd 1985-10-07 /BB-H506E-SM/01/cobol/documentation/cobol.utd 1985-10-10 /BB-H580E-SB_1985/01/cobol.utd 1985-10-10 /cobol12c/01/cobol.utd