Columbia subject headings:
Harvard subject headings:
Archival resources--Canada--Directories.
Archival resources--United States--Directories.
German Americans--Archives.
German Americans--Library resources.
Germany--History--Archival resources--Canada.
Germany--History--Archival resources--United States.
Germany--History--Library resources--Canada.
Germany--History--Library resources--United States.
Princeton subject headings:
Germany--History--Archival resources--Canada.
Germany--History--Archival resources--United States.
Germany--History--Sources--Directories.