Columbia subject headings:
Harvard subject headings:
Denmark--Emigration and immigration--History--18th century.
Germans--Denmark--Genealogy.
Germany--Emigration and immigration--History--18th century.
Immigrants--Denmark--Genealogy.
Immigrants--Russia--Genealogy.
Russia--Emigration and immigration--History--18th century.
Russian Germans--Genealogy.
Princeton subject headings:
Denmark--Emigration and immigration.
Germans--Denmark--Genealogy.
Germany--Emigration and immigration.
Immigrants--Denmark--Genealogy.
Immigrants--Russia--Genealogy.
Russia--Emigration and immigration.
Russian Germans--Genealogy.