Columbia subject headings:
Harvard subject headings:
Poetry, Modern--20th century--History and criticism--Congresses.
Poetry, Modern--21st century--History and criticism--Congresses.
Political poetry--History and criticism--Congresses.
Politics and literature--History--20th century--Congresses.
Politics and literature--History--21st century--Congresses.
Politics in literature--Congresses.
Princeton subject headings:
Poetry, Modern--20th century--History and criticism--Congresses.
Poetry, Modern--21st century--History and criticism--Congresses.
Political poetry--History and criticism--Congresses.
Politics and literature--History--20th century--Congresses.
Politics and literature--History--21st century--Congresses.
Politics in literature--Congresses.