American poetry 20th century History and criticism American poetry 21st century History and criticism Dissenters United States Literature and society United States Lyrik Persuasion (Psychology) in literature Persuasion (Rhetoric) in literature Poets, American 20th century Political and social views Politics and literature United States Protest poetry, American History and criticism Protestbewegung USA War and literature United States Öffentliche Meinung Öffentlichkeit Briefsammlung Duncan, Robert 1919-1988 Correspondence LITERARY CRITICISM / Poetry Literatur Literature Olson, Charles 1910-1970 Correspondence Poets, American 20th century Correspondence