Columbia subject headings:
Norway--Emigration and immigration--History--19th century.
Sweden--Emigration and immigration--History--19th century.
Harvard subject headings:
Norway--Emigration and immigration--History--19th century.
Scandinavians--United States.
Sweden--Emigration and immigration--History--19th century.
Princeton subject headings:
Scandinavia--Emigration and immigration--Economic aspects.
Scandinavian--Emigration and immigration--Social aspects.