Columbia subject headings:
Zonguldak (Turkey)--Emigration and immigration--Economic aspects.
Zonguldak (Turkey)--Emigration and immigration--Social aspects.
Harvard subject headings:
Zonguldak (Turkey)--Emigration and immigration--Economic aspects.
Zonguldak (Turkey)--Emigration and immigration--Social aspects.
Princeton subject headings:
Zonguldak (Turkey)--Emigration and immigration--Economic aspects.
Zonguldak (Turkey)--Emigration and immigration--Social aspects.