Columbia subject headings:
Scotland--Emigration and immigration--History--19th century--Statistics.
Scotland--Emigration and immigration--History--20th century--Statistics.
Scots--Foreign countries--Statistics.
Harvard subject headings:
Migration, Internal--Scotland--History.
Scotland--Emigration and immigration--History--19th century.
Scotland--Emigration and immigration--History--20th century.
Scots--Foreign countries--History--19th century.
Scots--Foreign countries--History--20th century.
Princeton subject headings: