Actually I’m just waiting for those two great books to be delivered to my threshold:
One of them is about Polabian Slavonics ,very detailed and icluding even the smallest tribes. It describes thousands of battles against “mutes” and Danes. Economy ,everyday life, combat methods, religion (as we all know they were the most faithful rodnovers of all).
The second one focus on the raid of prince Racibor on Konungahela.