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I'm having a bit of trouble with some calculating.
The Duchy of Styria was 22,425 km2
Styria the state is 16,401.04 km2
What was the size of Styria in German-Austria? Wikipedia says 22425 km2, but that's the size of the entire Duchy, not the requested German-speaking area. It has to be between 16,401.04 and 22,425 km2.
I can't use the old 5 Kreise, as the Marburger Kreis was bigger than the requested area. I don't need the area of Untersteiermark itself, which is too large. The Municipalities of Slovenia are too large as of 2011.
Does anyone have any websites or sources that could help figure this out?