id	keyword
cpos-79	fertility
cpos-79	germany
cpos-79	data
cpos-79	level
cpos-79	spatial
cpos-79	austria
cpos-79	period
cpos-79	social
cpos-79	sub
cpos-79	trends
cpos-79	population
cpos-79	convergence
cpos-79	switzerland
cpos-79	variation
cpos-79	family
cpos-79	saxony
cpos-79	european
cpos-79	fertility trends
cpos-79	rate
cpos-79	time
cpos-79	princeton
cpos-79	bremen
cpos-79	differences
cpos-79	huinink
cpos-79	countries
cpos-79	regions
cpos-79	fertility rate
cpos-79	johannes
cpos-79	basten
cpos-79	areas
cpos-79	sebastian
cpos-79	analysis