Columbia subject headings:
United States--History--Sources--Periodicals.
United States. National Historical Publications and Records Commission--Periodicals.
Harvard subject headings:
United States--History--Sources--Periodicals.
United States. National Historical Publications and Records Commission--Periodicals.
Princeton subject headings:
Periodicals.
United States--History--Sources--Bibliography--Periodicals.
United States. National Historical Publications and Records Commission--Periodicals.