BIG OL' KATIE. See

MY THREE SONS.

BIGHORN SHEEP. Troll Associates. 4 min., si., color, Super 8 mm. Loop film. © Troll Associates; 16Jan70; MP20674.

BIOCHEMISTRY OF ENZYME ACTION (Filmstrip) No. 1564. Popular Science Audio-Visuals. 42 fr., color, 35 mm. (A Biology release) With Filmstrip guide, 5 p. © Popular Science Audio-Visuals, Inc.; 1Sep69; A196086.

BIRD MIGRATION. Troll Associates. 4 min., si., color, Super 8 mm. Loop film. © Troll Associates; 16Jan70; MP20715.

BIRDS OF THE GALAPAGOS. Hartley Productions. 15 min., sd., color, 16 mm. Appl. author: Elda Hartley. © Hartley Productions, Inc.; 23Oct70; MP20982.

BISON. Troll Associates. 4 min., si., color, Super 8 mm. Loop film. © Troll Associates; 16Jan70; MP20678.

BLACK MEN AND IRON HORSES. New York Times Co. & Arno Press. 18 min., sd., color, 16 mm. A Rediscovery production. © New York Times Co.; 15Nov69; LP38060.

BLACK PARTICIPATION IN THE CIVIL WAR (Filmstrip) Silver Burdett Co. Made by Blackside. 56 fr., color, 35 mm. (Studies in the history of black Americans) With Teacher's guide, 19 p. © Blackside, Inc.; 17Jul70; A178324.

THE BLACK REVOLUTION (Filmstrip) Silver Burdett Co. Made by Blackside. 63 fr., color, 35 mm. (Studies in the history of black Americana) With Teacher's guide, 19 p. © Blackside, Inc.; 17Jul70; A178319.