Motion pictures and filmstrips, January-June 1971

by Library of Congress. Copyright Office

MOLDING.

POLYURETHANE FOAM. See

MOLDING.

PLASTER MOLD MAKING.

USING PLASTER MOLD.

THE POND ENVIRONMENT. I-IV. Thorne Films. 4 motion pictures (4 min. each), si., color, Super 8 mm. Loop film. © Thorne Films, Inc.; 1Dec70; MP21326-21329.

POPULATION STATISTICS. See

THE ECOLOGICAL CRISIS.

POPULATION TRENDS. See

THE ECOLOGICAL CRISIS.