Columbia subject headings:
Copyright--Information storage and retrieval systems--United States--Congresses.
Intellectual property--United States--Congresses.
Library information networks--United States--Congresses.
Harvard subject headings:
Copyright--Databases--United States--Congresses.
Copyright--Information storage and retrieval systems--United States--Congresses.
Intellectual property--United States--Congresses.
Library information networks--United States--Congresses.
Princeton subject headings: