The collection consists of correspondence, writings, notebooks, photographs, and printed matter. Frankl's correspondents include Klaus Berger, Roger Baldwin, Fyke Farmer, Margaret Fries, Helmuth Gottschalk, Georg Hoeltje, Richard Krautheimer, Erwin Panofsky, Josepha Weitzman-Fiedler, and others. There is a large selection of correspondence with Nikolaus Pevsner (1947-1961) about the publication of Frankl's Gothic Architecture for the Pelican History of Art, edited by Pevsner. There are also drafts of letters by Frankl to Pearl Buck and Albert Einstein.

Works include a partial manuscrtipt, illustrations, and photographs for The Gothic (1960); manuscripts and notes in English and German for Gothic Architecture (1962); manuscripts in German, French, and English for Frankl's work on world government, Weltregierung (1948), with other writings by Erich Kahler and Peter Frederic West, and printed matter also related to a proposed international organization of government; typescripts (1961) for Zu Fragen des Stiles (edited by Ernst Ullman and published in 1988); several articles, notes, and photographs on stained glass; and miscellaneous writings. Also present are photographs of examples of Gothic architecture and four photographs of Frankl; miscellaneous printed material, including a copy of Die Entwicklungsphasen der Neueran Baukunst (1914); 35 notebooks of notes on architecture and other topics; 14 daily diaries (1936-1949); and a charcoal portrait (1900) of a Jew by the artist Jan Styka.