Union nurse Clara Barton in March 1865.
Charles R. B. Claflin (1817-1897) / Claflin's Photographic Gallery, 229 Main Street, Worcester, Mass.
<a class="external free" href="https://commons.wikimedia.org/wiki/File:Clara_Barton_by_Charles_R._B._Claflin,_front-_Original.tif">https://commons.wikimedia.org/wiki/File:Clara_Barton_by_Charles_R._B._Claflin,_front-_Original.tif</a>