What do any of those links have to do with ethnicity? They all deal with material culture, ranging mainly across Northern Germany, from Holland down to Hesse to the Baltic Sea. It's almost like you posted them to obfuscate on the basis that if they're in German I wouldn't understand any of the titles. A bit like a certain other poster used to do. Ich hab' Angst, dass wir noch eine Sockenpuppe haben.