Timothy H. O'Sullivan 1865 Petersburg, Va. Mills; photographic wagon of Engineer Dept. in foreground
Stereograph, glass, wet collodion, detail Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-cwpb-00613 (digital file from original neg.) LC-B8171-1105 (b&w film neg.), Call Number: LC-B815- 1105 [P&P]
