On verso: "Prof. Leo Sternberg, Petersburg, former member of Council of State, Russia. Prof. Franz Boas, Columbia Univ., N.Y. Bogoras, Russl." Probably taken during International Congress of Americanists at Hague and Goteburg, summer 1924, when Bogoras and Shternberg finally were permitted to travel to Western Europe. See Darnell, Regna and Frederic W. Gleach, Histories of Anthropology Annual, Volume 2, p. 48. Old call number: B B61 no. 11, folder 6 (Special occasions).