Columbia subject headings:
Harvard subject headings:
BBC Radio--History--20th century.
Germans--Germany (East)--Correspondence.
Germany (East)--History--Sources.
Germany (East)--In mass media.
Germany (East). Ministerium für Staatssicherheit--Public opinion.
Radio audiences--Germany (East)
Radio broadcasting--England--London--History--20th century.
Radio journalism--England--London--History--20th century.
Radio programs--England--London--History--20th century.
Princeton subject headings:
BBC Radio--History--20th century.
Germans--Germany (East)--Correspondence.
Germany (East)--History--Sources.
Germany (East)--In mass media.
Radio audiences--Germany (East).
Radio broadcasting--England--London--History--20th century.
Radio journalism--England--London--History--20th century.
Radio programs--England--London--History--20th century.