TRIGGER FILMS AND VIDEOTAPES ON HUMAN INTERACTIONS (series of nine 16 mm films or videotapes, color, 1981). Produced and distributed by Human Services Development, 1616 Soldiers Field Road, Boston, Massachusetts 02135. Prices vary because programs are of different length, but 16 mm films sell for approximately $350 each and videotapes are $195. Three-day rental for a film is $60

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