Columbia subject headings:
Hours of labor--United States--Statistics.
Law firms--United States--Statistics.
Lawyers--United States--Statistics.
Harvard subject headings:
Hours of labor--United States--Statistics.
Law firms--United States--Statistics.
Lawyers--United States--Statistics.
Princeton subject headings:
Hours of labor--United States--Statistics.
Law firms--United States--Statistics.
Lawyers--United States--Statistics.
Statistics.