Columbia subject headings:
Law libraries--Canada--Statistics--Periodicals.
Law libraries--United States--Statistics--Periodicals.
Medical libraries--Canada--Statistics--Periodicals.
Medical libraries--United States--Statistics--Periodicals.
Harvard subject headings:
Academic libraries--Canada--Statistics--Periodicals.
Academic libraries--United States--Statistics--Periodicals.
Law libraries--Canada--Statistics--Periodicals.
Law libraries--United States--Statistics--Periodicals.
Medical libraries--Canada--Statistics--Periodicals.
Medical libraries--United States--Statistics--Periodicals.
Princeton subject headings:
Law libraries--Statistics--Periodicals.
Medical libraries--Statistics--Periodicals.
Periodicals.
Statistics.