Free audiotapes, videotapes, scripts, and transcriptions are referenced in this twentieth edition of the guide which was assembled to help teachers and librarians select materials which encourage students to inquire, discover, and develop the ideas which will enable them to contribute to society. Entries are listed under curricular areas: accident prevention and safety, aerospace education, business education, clubs, communications and transportation, environmental education, fine arts, guidance, health education, home economics, industrial education, language arts, religion, science, social problems, social studies, and teacher reference and professional growth materials. Information about each entry provided in the body of the guide includes type of medium, specifications, length, a content description, and the source. Also included are a title index, subject index, source and availability index, and a Canadian availability index. (SH)