by later hand, on mount, upper right in graphite: 40.
(Robert Hershkowitz, Ltd., Sussex, England); purchased with donated funds by NGA, 1997.
- Photographs from the Collection, National Gallery of Art, Washington, 1999.
- Hershkowitz, Robert. "Cundall's and Howlett's Crimean Heroes." History of Photography 17, no. 1 (Spring 1993): pp. 120-121, illus. fig. 3.