Columbia subject headings:
Steinbeck, John, 1902-1968--Political and social views.
Vietnam War, 1961-1975--Literature and the conflict.
Harvard subject headings:
Politics and literature--United States--History--20th century.
Steinbeck, John, 1902-1968--Political and social views.
Vietnam War, 1961-1975--Literature and the war
Princeton subject headings:
Steinbeck, John, 1902-1968--Political and social views.
Vietnam War, 1961-1975--Literature and the war.