Case study data on productivity and factory performance, gray iron foundries, July 1951. - [Washington, U.S. Govt. Print. Off., 1951] - 104 p. illus., forms. 27 cm. LCCN: l 52000017 Subjects--Topical Terms: Labor productivity--United States.Foundries--United States) LC Class. No.: TS233 / .U553