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MOTION PICTURES 35 tailings; collection of concentrates on suction filters; shipment to smelter. (15 minutes, silent) 17 Copper Mining in Arizona U.S. Bureau of Mines in cooperation with Phelps Dodge Co., 1938. Open pit and underground mining at Morenci, Ajo, Jerome and Bisbee: diamond drilling; air drilling and blasting; churn drilling; and blasting in open pit mining; tunnel driving and sinking a shaft with rotary drill in underground mining. (45 min- utes, silent) 17 Copper Refining U.S. Bureau of Mines in cooperation with Phelps Dodge Corp., 1938. Convert- ing anode slabs from smelter into chem- ically pure copper bars with starting- sheet copper cathodes in electrolytic tanks; inspecting and shipping bars to fabrication plant for making wire and other products. (15 minutes, silent) 17 Copper Smelting U.S. Bureau of Mines in cooperation with Phelps Dodge Corp., 1938. Convert- ing copper ore and concentrates into metallic copper: crushing, sampling of ore and mixing with concentrates; roast- ing; melting in reverberatory furnaces; removal of impurities in converters and anode furnaces; and casting of metal into anodes. (15 minutes, silent) 17 The Coppersmith: Flaring and Re- ducing U.S. Department of the Navy, 1942. (Shipbuilding Skills Series) How to flare and reduce small and large tubing; devices used; techniques of annealing, bumping, cleaning and finishing. Sup- plementary filmstrip, same title, also available. (MN 2346-a; 18 minutes) 41 The Coppersmith: Working Out Branches From A Line U.S. Department of the Navy, 1944. (Shipbuilding Skills Series) Cutting, working out, and installation process; marking, cutting and raising of the cup to conform with the branch, tack-welding and fitting, and installation of a saddle branch. Supplementary filmstrip, same title, also available. (MN 2346-b; 22 minutes) 41 Corinth Canal U.S. Economic Cooperation Administra- tion, 1950. Historical and present day importance of Corinth Canal to Greece's prosperity; how it was wantonly de- stroyed during the war and recently rebuilt with American help in 1948; pas- sage of Greek ship through canal for first time since war. (10 minutes) 24 O Corpo Humano U.S. Office of Inter-American Affairs, 1945. (Saude para as Americas) Portu- guese version of "The Human Body.'* Spanish version, "El Cuerpo Humano," also available. (9 minutes, color) 37 Corralling the Colorado U.S. Bureau of Reclamation, 1951. How Hoover Dam tamed and Davis, Parker and Imperial Dams utilized the Colorado River; regional history and problems: deserts, droughts, and floods; primitive irrigation; modern dams; industries and hydropower. (27 minutes) 18, 41 The Correct Use of the Official Tele- phone in the U.S. Army Administra- tion U.S. Department of the Army, 1944. Fundamentals in efficient placing, receiv- ing, and handling telephone calls; use of directory; and rules of courtesy and enunciation. (FB 104; 19 minutes) 41 Cotton at War: Cotton Industry U.S. Department of the Army, 1944. Cotton's contribution to the war effort. Combat and training scenes show that everything that shoots, flies, floats, rolls,