Columbia subject headings:
Harvard subject headings:
Germans--North America--Migrations--History--18th century--Congresses.
Germans--United States--Migrations--History--19th century--Congresses.
Germany--Emigration and immigration--History--18th century--Congresses.
Germany--Emigration and immigration--History--19th century--Congresses.
Princeton subject headings:
Germans--Migrations--History--18th century.
Germans--Migrations--History--19th century.
Germany--Emigration and immigration--History--18th century.
Germany--Emigration and immigration--History--19th century.