Columbia subject headings:
Industrial productivity--United States--Congresses.
Patents--United States--Congresses.
Research, Industrial--United States--Congresses.
Harvard subject headings:
Industrial productivity--United States--Congresses.
Patents--United States--Congresses.
Research, Industrial--United States--Congresses.
Princeton subject headings:
Industrial productivity--United States--Congresses.
Patents--United States--Congresses.
Research, Industrial--United States--Congresses.