you see, I've been doing some little project, and i need some information sources for 2 themes:
I'll be very grateful
I hope some of literature lists in the following previous posts of mine might help you with your project:
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I'd also recommend Sarnowsky's articles and books (though unfortunately many are in German) on Teutonic Order, such as: https://www.chbeck.de/sarnowsky-deutsche-orden/product/20987