Dear Pat (and others),

I never did find much, I'm sorry to say. This was a while ago, now, but if I recall correctly the only images specific to the 13th that I managed to come across and use were related the regimental flag: http://www.sos.state.mi.us/history/museum/explore/museums/hismus/special/flags/flags3.html.

Though I don't mean to plug it, you can read about the finished book here, if you're interested: http://brianfloca.com/FromSlaveToSoldier.html

Best,
Brian