International Academy of Philosophy, Erlangen, 1924, Unidentified Artist, c. 1924, Harvard Art Museu
International Academy of Philosophy, Erlangen, 1924, Unidentified Artist, c. 1924, Harvard Art Museums: PhotographsHarvard Art Museums/Busch-Reisinger Museum, Gift of Ise Gropiushttps://www.harvardartmuseums.org/collections/object/52958 -- source link
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