Motion pictures and filmstrips, January-June 1971

by Library of Congress. Copyright Office

RESEARCH SKILLS: CHOOSING AND NARROWING A TOPIC.

RESEARCH SKILLS: PLANNING THE PAPER.

ENGLISH SUPPLEMENT. See

1967 ENGLISH SUPPLEMENT.

ENVIRONMENT IN CRISIS. See

PROBLEMS OF CONSERVATION: WILDLIFE.

ENZYMATIC HYDROLYSIS. Thorne Films. 4 min., si., color, Super 8 mm. (Digestion) Loop film. © Thorne Films, Inc.; 1Dec70; MP21439.

ENZYME ACTION. See

CATALASE.

EFFECT OF pH.