The Subject Index Cards series contains the individual broadcasts from each reel or cassette. There are several broadcasts on each reel or cassette, and the index card system was devised to easily parse out the contents from each reel or cassette without having to dig through the physical tapes. The index cards are catalogued by subect. Westerman's original subject headings were lost during a change of residence, and additional subject headings were added by the Eastern Michigan University archives staff in 2017.