Columbia subject headings:
Germany (West)--Economic conditions--Directories.
Industries--Germany (West)--Archival resources--Directories.
Harvard subject headings:
Boards of trade--Germany--Archives.
Business enterprises--Germany--Archives.
Commercial associations--Germany--Archives.
Germany (West)--Economic conditions--Archival resources--Directories.
Industries--Germany (West)--Archival resources--Directories.
Princeton subject headings: