Sources:
“A Concise History of Poland” (2019) by Jerzy Lukowski and W.H. Zawadzki.. Cambridge University Press, Cambridge, UK.
https://www.britannica.com/place/Pola...
Audio:
Inritter: https://commons.wikimedia.org/wiki/Fi...
Pictures requiring attribution:
https://pastebin.com/bJPFC4mA
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