IBM Application Systems 400 Languages COBOL/400 Reference Summary

IBM AS/400 TM Languages RPG/400 Reference 1st Print 1988 (used)

IBM AS/400 TM Programming: Data Base Guide. 1st Print 1988 (used)

IBM System 370 Reference Summary Card - Fourth Edition Nov 1976 (Vintage)

IBM Systems / 36 Procedures and Commands Summary Manual VTG 1987 6th Edition

Vintage IBM 370 Reference Summary & IMS/VS App Pgm Reference Summary + Templates

IBM System 370 Reference Summary Card - Eighth Edition Feb 1989 - GX20-1850-7

Official IBM DSF Reference Summary Manual 1992 & DIAL-IBM Reference Card 1991