Maintains that the definitions of what constitute primary and secondary sources in historical studies are arbitrary and oversimplified. Proposes three major categories and provides examples of each. Stresses the importance of these classifications in teaching students to be discriminating in their search for historical truths. (RW)

Presents a discussion of laser disk systems developed by different institutions to store and distribute information and visual images. Includes information on storage, preservation, and use in the classroom or for research. Evaluates image quality, storage capacity, and transmissibility. Urges use of the videodisk to organize information and…