Articles, artifacts, audio cassette, historical documents, instruction system design handbooks, manuals, papers, photographs, publications, teaching aids and devices, and teaching methods handbooks, which document the pioneering audio tutorial system of instruction of Professor Samuel N. Postlethwait during the 1960s and early 1970s.

This series is comprised of Postlethwait’s general information handouts for Biology 108 and 109, along with various study guides and articles used in the classes. There is also a guest book for the Minicourse Development Project.