Time Life's Echoes of Glory Arms and Equipment of the Confederacy, page 15 is a full page copy of the photo with pretty good clarity. I once did a study on this photo. It was a rainy day. Rosenstock was the photographer.
A good photograph to study is found at....
http://americanhistory.si.edu/militaryhistory/exhibition/zoomify.asp?id=802&type=g&width=640&height=480&hideAlt=1
Use the zoom tool.
The Mississippi History Board discussion from 2006 can be found at....
http://history-sites.com/cgi-bin/bbs53x/mscwmb/arch_config.pl?noframes;read=9601
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David Upton