DjVu

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This has been the number 1 best-selling COBOL book for professional programmers since its first edition in 1979. It is the only book that shows how to design, code, test, and maintain structured COBOL programs on the IBM mainframes (or enterprise systems) that are used by the largest companies in the world. Besides COBOL, this book presents the IBM products that every mainframe programmer needs to know including TSO, ISPF, OS/390 JCL, VSAM Access Method Services, CICS, and DB2.