1. A Rough Business: Fighting the Civil War in Missouri edited by William Garrett Piston (The State Historical Society of Missouri, 2012).
A nice compilation of 14 articles previously published in Missouri Historical Review. This is the second volume of this type to be released [see The Civil War in Missouri: Essays from the Missouri Historical Review, 1906-2006, 2006]. This one purports to emphasize military history, but that appears to be only partially accurate. It is a nice looking book with some great selections for those of us who don't subscribe to the journal or have back issues handy.
2. The Maps of Antietam: An Atlas of the Antietam (Sharpsburg) Campaign, including the Battle of South Mountain, September 2 - 20, 1862 by Bradley M. Gottfried (Savas Beatie, 2012).
The third book in the Savas Beatie Military Atlas Series.