1911-1979 1917-1977 1939-2013 20thcentury americanpoetry criticismandinterpretationbishop criticismandinterpretationheaney criticismandinterpretationlowell criticismandinterpretationmerrill derek elizabeth english-speakingcountries englishpoetry history historyandcriticism historyinliterature inliterature jamesingram literatureandhistory memorialsinliterature memoryinliterature monumentsinliterature robert seamus