Columbia subject headings:
American periodicals--Indexes.
American poetry--20th century--Indexes--Periodicals.
Poetry--Indexes--Periodicals.
Harvard subject headings:
American periodicals--Indexes--Periodicals.
American poetry--20th century--Indexes--Periodicals.
Poetry--Indexes--Periodicals.
Princeton subject headings:
American periodicals--Indexes--Periodicals.
American poetry--20th century--Indexes--Periodicals.
Poetry--Indexes--Periodicals.