id	keyword
cpos-285	migration
cpos-285	migratory
cpos-285	movements
cpos-285	north
cpos-285	reurbanisation
cpos-285	rhine
cpos-285	westphalia
cpos-285	years
cpos-285	und
cpos-285	data
cpos-285	development
cpos-285	municipalities
cpos-285	state
cpos-285	der
cpos-285	period
cpos-285	concentration
cpos-285	centres
cpos-285	cities
cpos-285	germany
cpos-285	north rhine
cpos-285	areas