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bochum
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1
dortmund
1
empire
1
german
1
germanization
1
germany
1
herne
1
identity
1
industrialization
1
kaissereich
1
migrant
1
mine
1
nation
1
nation-building
1
pole
1
polish
1
question
1
region
1
reichsvereinsgesetz
1
ruhr
1