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Cooper, R.H.
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File processing with COBOL/WATBOL: part 1 / Cooper, Cowan, Dirksen, and Graham.
File processing with COBOL/WATBOL: part 1 / Cooper, Cowan, Dirksen, and Graham.
File processing with COBOL/WATBOL : part 2 / Cooper, Cowan, Dirksen, and Graham.
File processing with COBOL/WATBOL : part 2 / Cooper, Cowan, Dirksen, and Graham.