moma-photography:

Georgia O'Keeffe, Alfred Stieglitz, 1927, MoMA: Photography

Alfred Stieglitz Collection. Gift of Georgia O'Keeffe
Size: 3 7/16 × 3 ¼" (8.7 × 8.2 cm)
Medium: Gelatin silver print

http://www.moma.org/collection/works/46441