Alfred Stieglitz, Sun Rays—Paula, Berlin, 1889, printed 1920/39, Gelatin silver print, Art Institute of Chicago, Chicago. https://dartabase.art/cite/aic/66284

Alfred Stieglitz, Das Zwischendeck, 1907, Heliogravüre auf Japanpapier, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/102613

Alfred Stieglitz, Equivalent, 1926, Gelatin silver print, Art Institute of Chicago, Chicago. https://dartabase.art/cite/aic/66625