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The most thorough examination of the Silas Chandler story, the photograph, and the historical evidence, appears in the February 2012 issue of
Civil War Times, in an article by Myra Chandler Sampson and Kevin Levin, the former being a direct descendant of Silas Chandler.
It's available on Academia.edu, but registration is required.
The image itself was subsequently donated to the Library of Congress by its owner, Chandler Battaile Jr.,
and is part of the Liljenquist Family Collection there.