Columbia subject headings:
Information storage and retrieval systems--Law--United States.
LEXIS (Information retrieval system)
Legal research--United States--Data processing.
WESTLAW (Information retrieval system)
Harvard subject headings:
Information storage and retrieval systems--Law--United States.
LEXIS (Information retrieval system)
WESTLAW (Information retrieval system)
Princeton subject headings:
LEXIS (Information retrieval system)
Legal research--United States--Data processing.
WESTLAW (Information retrieval system)