Educational screen & audio-visual guide (c1956-1971])

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THREE NEW OZALID TRAHSPARENCY MASTERS SETS Professional Teaching Transparencies at a new low cost from Ozalid ready-to-prepare materials Create your own brilliant, attention-holding projection transparencies for high school science courses in minutes at H the cost of purchased transparencies. Each Ozalid® Transparency Masters Set provides everything you need : preprinted art masters, Ozalid diazo transparency films, transparency mounts, protective file, mounting tape, and simple instructions. Three new subjects help you increase your classroom effectiveness: Botany, Zoology, and Human Biology. Two others already in extensive use are Chemistry and General Science. Do-it-yourself economy means not only can your purchase be readily justified but you triple the scope of your budget. For information on Ozalid Transparency Masters Sets and the special reduced-price package plan covering the complete Ozalid Overhead Projection System, write Ozalid, Dept. 393 Binghamton, N.Y. Or call your Ozalid Audio Visual Dealer listed in the Yellow Pages or your local Ozalid District Office. Educational Screen and Audiovisual Guide — November, 1962 639