on mount, lower right in graphite: 20
David and Mary Robinson, Sausalito, CA; NGA purchase, 1995.
- The First Century of Photography: New Acquisitions, National Gallery of Art, Washington, 1995.
- Building a Collection, National Gallery of Art, Washington, 1997-1998, no. 84.
- Talbot, William Henry Fox. The Pencil of Nature. London: Longman, Brown, Green, & Longmans, 1844, illus. pl.xx.
- Masterpieces of Photography From the George Eastman House Collections. New York: Abbeville Press, 1985, p.30.