Columbia subject headings:
Copyright--United States.
Fair use (Copyright)--United States.
Photocopying--Fair use (Copyright)--United States.
Harvard subject headings:
Copyright--United States.
Fair use (Copyright)--United States.
Photocopying--Fair use (Copyright)--United States.
Princeton subject headings:
Copyright--United States.
Fair use (Copyright)--United States.
Photocopying--Fair use (Copyright)--United States.