Columbia subject headings:
Jails--United States--Statistics.
Prisoners--United States--Statistics.
Prisons--United States--Officials and employees--Statistics.
Harvard subject headings:
Jails--United States--Statistics.
Prisoners--United States--Statistics
Prisons--Officials and employees--United States--Statistics.
Princeton subject headings:
Jails--United States--Statistics.
Prisoners--United States--Statistics.
Prisons--Officials and employees--United States--Statistics.
Statistics.