Columbia subject headings:
Parole--United States--Statistics--Periodicals.
Prisoners--United States--Statistics--Periodicals.
Prisons--United States--Statistics--Periodicals.
Harvard subject headings:
Parole--United States--Statistics--Periodicals.
Prisoners--United States--Statistics--Periodicals.
Prisons--United States--Statistics--Periodicals.
Princeton subject headings:
Parole--United States--Statistics--Periodicals.
Periodicals.
Prisoners--United States--Statistics--Periodicals.
Prisons--United States--Statistics--Periodicals.
Statistics.