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18 U. S. GOVERNMENT FILMS Black Bullets U.S. Department of the Army, 1945. Captured German and Japanese footage shows how enemy mined coal with slave labor. Importance of miner in war strategy of armies that move on coal- dependent vehicles, planes, and ships. (WF 55; 14 minutes) 41 Black Marketing U.S. Office of War Information, Domestic Branch, 1943. Actual, typical case from the files of the Office of Price Administra- tion; how the black market operates; and, how it is defeated by public coop- eration with OPA and local law-enforce- ment officials. (11 minutes) 32, 41 The Blacksmith: Calculating and Bending Rings and Links U.S. Department of the Navy, 1944. (Shipbuilding Skills Series) Elementary shipsmithing including linear calculation of stock, forming of rings and links, forge welding and use of common black- smith's tools. (MN 2350-a; 21 minutes) 41 The Blacksmith: Calculating and Forging a Deck Socket Wrench U.S. Department of the Navy, 1944. (Shipbuilding Skills Series) How to forge a deck-socket wrench; read blue- print, select stock, forge and finish. Diagrams. (MN 2350-b; 21 minutes) 41 Blanking and Piercing U.S. Bureau of Mines in cooperation with Aluminum Co. of America, 1944. (How to Form Aluminum Series) Blank- ing, piercing, and perforating techniques in scenes and animated drawings; Guerin or rubber-pad method; and the use and care of the tools and materials employed. (16 minutes) 17 Blanking Sheet Metal on the Squar- ing Shear U.S. Office of Education, 1943. (Aircraft Work Series. Blanking Sheet Metal Work No. 1) How to lay out tapered blanks on an aluminum sheet; use holddowns and treadle; check blanks and trim blanks. Supplementary filmstrip, same title, also available. (OE 130; 15 min- utes) 32, 41 Blanking Sheet Metal with Hand Snips U.S. Office of Education, 1943. (Aircraft Work Series. Blanking Sheet Metal No. 2) How to cut along a straight line; cut an outside circle, a notch, an inside line; and remove burrs left by cutting. Supplementary filmstrip, same title, also available. (OE 131; 18 minutes) 32, 41 Blanking with Rotary and High Speed Shears U.S. Office of Education, 1945. (Aircraft Work Series. Blanking Sheet Metal No. 4) How to set up rotary and high-speed shears; make test cuts; and operate the shears. Supplementary filmstrip, same title, also available. (OE 292; 16 min- utes) 32, 41 Blanking with the Swing Arm Router U.S. Office of Education, 1944. (Aircraft Work Series. Blanking Sheet Metal No. 3) How to operate a swing-arm router; set up the work and template for routing ; change router bits; rout internal and external contours. Supplementary film- strip, same title, also available. (OE 132; 17 minutes) 32, 41 Blessings of Grass U.S. Department of Agriculture, 1940. Range management in western National Forests; perpetuating grazing lands by protecting them from overuse to insure future of livestock and grazing industry. (21 minutes) 3, 32 Blind Riveting U.S. Office of Education, 1945. (Aircraft Work Series. Assembling and Riveting No. 8) Necessity for blind riveting; how to rivet parts that are completely blind; use special tools and rivets in blind