| Timothy H. O'Sullivan Petersburg, Va. Mills; photographic wagon of Engineer Dept. in foreground 1865 Stereograph, glass, wet collodion 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] LL/61350
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