Doheny Memorial Library, University of Southern California, 1933-1982. Scene from Dante's Inferno, Canto XXXII: "I turned me round and saw before me and underfood a lake that from the frost a semblance had of glass." Image courtesy of University Archives.
Image below is courtesy of Dr. Gerald Jones, who studied at USC 1964-1968. In the early 1990s, Dr. Jones contacted the Southwest Museum and had prints made from the glass slides.