Columbia subject headings:
Harvard subject headings:
Child labor--Europe--History.
Foreign workers, European--Germany--Swabia--History.
Foreign workers, German--Europe--History.
Immigrant children--Europe--History.
Swabians--Alps Region--History.
Swabians--Europe--History.
Princeton subject headings:
Child labor--Germany--Oberschwaben--History.
Foreign workers--Germany--Oberschwaben--History.