Columbia subject headings:
Harvard subject headings:
Germany (East)--Relations--Germany (West)
Germany (West)--Relations--Germany (East)
Germany--History--1945-1990.
Parcel post--Germany--History--20th century.
Postal service--Germany--History--20th century.
Princeton subject headings:
Parcel post--Germany (East)--History.
Parcel post--Germany--History--20th century.
Postal service--Germany (East)--History.
Postal service--Germany--History--20th century.