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- WELBURN, Tyler. Advanced Structured COBOL : Batch, On-line, and Data-base Concepts. 1. ed. Palo Alto : Mayfield Publ. Co., 1983. 654 s. ISBN 0-87484-558-0. [Copy count : 1, currently available 1, at library only 0]
book
- WELBURN, Tyler. Structured COBOL : Fundamentals and Style. 1. ed. Palo Alto : Mayfield Publ. Co., 1981. 534 s. ISBN 0-87484-543-2. [Copy count : 1, currently available 1, at library only 0]
book