Columbia subject headings:
Frisians--United States.
Frisians.
Immigrants--United States--History--19th century.
Immigrants--United States--History--20th century.
Harvard subject headings:
Frisians--United States.
Frisians.
Immigrants--United States--History--19th century
Immigrants--United States--History--20th century
Princeton subject headings:
Frisian Americans--History.
Immigrants--United States--History.
United States--Emigration and immigration--History.