Haas, Kenneth Brooks 1898- Preparation and use of audio-visual aids Kenneth B. Haas and Harry Q. Packer. - 3d ed. - New York : Prentice-Hall, 1960. - 381 p. : illus. ; 24 cm. LCCN: 55007628 Subjects--Topical Terms: Audio-visual education. LC Class. No.: LB1043 / .H3 1955 Dewey Class. No.: 371.335 / HAP 1960