Preston, Edward J., 1947- CAD/CAM systems justification, implementation, productivity measurement Edward J. Preston, George W. Crawford, Mark E. Coticchia - New York M. Dekker c1984 - x, 358 p. ill 24 cm. - Mechanical engineering 33 . Subjects--Topical Terms: CAD/CAM systems Dewey Class. No.: 670.42 / 7