Writing previously on this subject, I worried about a soldier’s wartime letter disappearing into a private collection, never to be seen again. That was as nothing compared to what I found online today. Oh how I wish now I’d gone for the money instead of personal satisfaction and life-balance in my career choices.
Cowan Auctions is selling a mass of Americana on November 16th. There are some truly magnificent finds for the student of the American Civil War listed in the catalog. This looks like a wide array of archives and artifacts.
I’d be overjoyed if collectors of historical ephemera would publish online, or loan to museums, or at least make scans or transcriptions of their treasures available to the rest of us. In the meantime, I’m snatching digital samples related to Antietam and the Campaign as they go by.
After a little more research, I expect to use some of this material on AotW:

W.W. Blackmar
I have a special fascination with Medal of Honor recipients. One I’d not previously associated with the Maryland Campaign is Captain Wilmon Whilldin Blackmar of Boston. That’s him above, from a gilt-framed CDV, part of Lot 232 (est. $3,000-4,000). Blackmar
… enlisted as Corporal in Company K, 15th Pennsylvania Cavalry in August 1862. The novice regiment participated in the Maryland campaign before transferring west to join the Army of the Cumberland in December 1862 …

