Columbia subject headings:
Industrial productivity--Congresses.
Industrial productivity--United States--Congresses.
Productivity accounting--Congresses.
Harvard subject headings:
Industrial productivity--Congresses.
Industrial productivity--United States--Congresses.
Productivity accounting--Congresses.
Princeton subject headings:
Industrial productivity--Congresses.
Industrial productivity--United States--Congresses.
Productivity accounting--Congresses.