A total of 453 titles of filmstrips, slide sets, and sets of transparencies available free of charge to educators are listed in this guide. More than 20,000 separate frames are offered from 95 sources. Twenty of the filmstrips may be retained permanently by the borrower. The films cover topics in the fields of accident prevention, aerospace education, agriculture, art and handwork, business education, communications and transportation, driver education, geography, guidance, health and social hygiene, history, home economics, foods, interior design, industrial arts, science, social problems, and sports. The catalog lists the filmstrips alphabetically by title under the appropriate subject category, provides an annotation, and tells whether the filmstrip is silent or sound, in color or black-and-white, number of frames, date of release, and the agency from which it is available. The guide suggests ways to use filmstrips and procedures for booking free filmstrips. It provides a title index, a subject index, source and availability index, and a Canadian source list. The source and availability index describes the conditions of loan and the length in advance that filmstrips must be reserved. (JY)