http://dewey.info/scheme/edition/e23/ en
331.6 Workers by ethnic and national origin
331.62 Immigrants and aliens
331.6209 History, geographic treatment, biography 331.621 Immigrants and aliens from areas, regions, places in general 331.625496 Aliens--Nepal--labor economics 331.62667 Aliens--Ghana--labor economics
Dewey Decimal Classification
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