Hi Queequeg,
To me, the most comprehensive and best illustrated work on the Thirty Year War - and other Imperial Wars from ca. 1479-1719 - still is
http://www.amazon.de/kaiserlichen-Kr...6992643&sr=1-7
Unfortunately, I guess there is only a German version but the illustrations and dates assigned speak for themselves.
Apart from that, I posted several threads on Thirty Years War muskets and accouterments here.
Best,
Michael