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Productivity by Objectives by James L. Riggs Essentials of Engineering Economics by James L. Riggs The art of management by James L. Riggs Introduction to Operations Research and Management Science by James L. Riggs Theory And Problems Of Operations Research And Management Sci... by James L. Riggs The Productive Supervisor by James L. Riggs Sistemas de Producción by James L. Riggs Economic Decision Models for Engineers and Managers by James L. Riggs Engineering Economics by James L. Riggs Engineering Economics by James L. Riggs


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