Columbia subject headings:
American literature--20th century--Periodicals.
American literature--21st century--Periodicals.
American poetry--20th century--Periodicals.
American poetry--21st century--Periodicals.
Harvard subject headings:
American literature--20th century--Periodicals
American poetry--20th century--Periodicals
Princeton subject headings:
American literature--20th century--Periodicals.
American poetry--20th century--Periodicals.
Periodicals.