Osservazioni
Per confronto, vedasi: http://sammlungenonline.albertina.at/#1b2e0088-e71a-455d-bbc1-8e73f29e8f2d http://www.invaluable.com/artist/diem-peter-charles-51evi54995 ___ ELEANOR JEWETT, Peter Charles Diem Modernist Exhibits at Johnson Galleries, in "Chicago Tribune" 17 gennaio 1930, p. 18