The Polytechnic School Archives document a microcosm of a private school's activities for the past 100+ years relating, for instance, school life during WWI and WWII, the Cold War, etc., and the 1918 flu pandemic. The collection includes 60 file drawers, 30 shelves, and 50+ boxes of records. In many ways the collections relate to historical LA and Southern California.  

Special Collections at the Pomona Public Library maintains extensive pamphlet files of clippings, photographs, brochures, and other ephemera related principally to Pomona Valley and especially to the City of Pomona.