Motion pictures, January-June 1973

by Library of Congress. Copyright Office

Valves: what they are and how they work. Troll Associates. Made by the Lunaflick Company, Ltd. 4 min., si., color, Super 8 mm., in cartridge. © Troll Associates; 18Apr73; MP24534.

MP24535.

How do electrical circuits work? Troll Associates. Made by the Lunaflick Company, Ltd. 4 min., si., color, Super 8 mm., in cartridge. © Troll Associates; 18Apr73; MP24535.

MP24536.

Air: putting it to use. Troll Associates. Made by the Lunaflick Company, Ltd. 4 min., si., color, Super 8 mm., in cartridge. © Troll Associates; 18Apr73; MP24536.

MP24537.

Weetabix. CLWE0030. 30 min., sd., color, 16 mm. © Colgate Palmolive Company; 30Oct73; MP24537.

MP24538.

Wise and responsible consumership. Centron Educational Films. 14 min., sd., color, 16 mm. © Centron Corporation, Inc.; 12Oct73; MP24538.

MP24539.