by later hand (possibly Doris Bry), on mount, top left verso, in graphite: Tree set / Marked by OK.; upper left: 191A / [arrow]
Georgia O'Keeffe; gift to NGA, 1949.
- Greenough, Sarah. Alfred Stieglitz : The Key Set : The Alfred Stieglitz Collection of Photographs. Washington, 2002: vol. 2, cat. 1049.