Columbia subject headings:
Harvard subject headings:
Labor productivity--Case studies.
Retail trade--Germany
Retail trade--Germany (West)
Retail trade--Great Britain
Retail trade--United States
Wholesale trade--Case studies.
Princeton subject headings:
Labor productivity--Case studies.
Retail trade--Germany (West)
Retail trade--Great Britain.
Retail trade--United States.
Wholesale trade--Case studies.