Photographer unknown2018-09-252018-09-251936http://172.16.52.76:80/cdm/ref/collection/coll3/id/273https://hdl.handle.net/20.500.12111/4240SepiaPermission to use this image must be requested from the Institute's Archives. Please contact archives@ias.edu.Karl Menger, Marston Morse and an unidentified man in ViennaImage