The Circle of Classified Knowledge
One of a series of library education posters designed by Peabody Visual Aids in the 1930s and 1940s, which I salvaged from a throw-away pile at my library school in 2003. These were created under the supervision of visionary librarian Ruby Ethel Cundiff. bit.ly/qWQ3YD.
Many thanks to Gabriel Jaramillo at the Claremont Colleges Digital Library for the high-quality digitization.